Door shut behind you: what to do, in order
Updated 12 August 2026 · 5 min read
A door that has shut behind you isn't a life-threatening emergency, except in two specific cases this guide covers first. It is, above all, a situation where the bad decisions get made in the first ten minutes. Here's the order to work through.
The short version
- If a small child, an elderly person or a vulnerable adult is alone inside, call 18 or 112: the fire service takes priority and will arrive before any tradesperson.
- A slammed door and a locked door are different jobs at different prices. Work out which one you have, and say so on the phone.
- Don't try the bank-card trick: on a modern door it bends the latch or deforms the strike plate, turning a simple opening into a lock repair.
- What decides is the lock’s condition and who holds a key: lost or stolen keys, change the cylinder; if they had to drill, the replacement is part of the job. Lock intact and no key missing, turn down a replacement “just to be safe”.
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First: is this actually an emergency?
Two situations belong to the emergency services rather than a locksmith. If a young child, an elderly person or a vulnerable adult is alone inside, call 18 or 112 straight away: the fire service treats it as a priority and will arrive faster than any tradesperson.
The same applies if something is heating behind the door — a hob left on, a pan on the flame, an appliance running. The risk is no longer access, it's fire.
In every other case, including a pet alone inside, this is ordinary call-out work: you have time to make two phone calls and compare, and that time is often worth several hundred euros.
Work out what actually happened
A door that has pulled shut and a door that has been locked with the key are different jobs at different prices.
A slammed door is held only by the latch — the small bevelled bolt that springs back as the door closes — and usually opens with no damage and nothing dismantled.
A door locked with one or more turns of the key engages the deadbolt, sometimes several anchor points. Opening it takes longer, is more technical, and the chance of having to work on the cylinder is real.
So be ready to say on the phone which one you're facing: did you simply pull the door behind you, or did you turn the key? The answer determines the price anyone can honestly quote you.
Useful reflexes, in order
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Five well-spent minutes before calling anyone.
- Check whether a spare is reachable: partner, flatmate, trusted neighbour, building caretaker, agency if you rent.
- Look at other ways in: side door, a window left ajar, a balcony reachable without risk. Never attempt a route across a façade or a neighbour's balcony — that's the genuine danger in this situation.
- If you rent, tell the agency or landlord: some hold a spare, and some tenancies cover the call-out.
- Check your home insurance or premium bank card: many include a home-assistance or locksmith guarantee covering part or all of the cost.
- Only then call a locksmith — asking for the total price including VAT before they travel.
What not to do
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Three moves make things worse far more often than they help.
- Don't try to open the door yourself with a loyalty card or a thin blade. On a modern door it fails in the vast majority of cases, and it can bend the latch or deform the strike plate — turning a simple opening into a lock repair.
- Never force a key that's stuck or already bent in the cylinder. A key snapped inside the barrel moves the job from a simple opening to a full replacement.
- Don't surrender to the first number you find in a panic, especially one that won't quote a price. The ten minutes you "save" by calling without checking are exactly the ones the scam business model exists to exploit.
What should happen when the locksmith arrives
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They start by looking at the door and the lock type, then state the method and the price. On a slammed door they'll normally work by picking, by slipping a thin shim between frame and leaf, or via the edge of the door. The opening usually takes fifteen to thirty minutes.
Drilling is not the default: it's the last resort, on a door deadlocked with several turns, an already broken cylinder or a jammed mechanism. If it becomes necessary, it must be announced beforehand with the costed consequence — replacing the cylinder or the lock.
A professional will also ask you to show that you live there: ID, a bill, a tenancy document. That isn't suspicion, it's the basic rule that stops someone else's door being opened. Someone who asks for nothing at all should worry you more than someone who asks.
After the opening: does the lock need changing?
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The answer depends entirely on how the door was opened. Three situations, three answers.
- Opened without damage: no. An intact lock is still an intact lock, and being offered a replacement "to be safe" right after a clean opening has no technical justification.
- Keys lost or stolen: yes, but the cylinder alone is enough. The mechanism stays, only the part the key turns in changes, which neutralises every key in circulation for a fraction of the price of a full lock.
- Drilling was necessary: the replacement is part of the job. It belongs on the quote before the work, not discovered at payment time.
Frequently asked questions
How long does it take to open a slammed door?
Fifteen to thirty minutes in most cases, once the tradesperson is on site. The factor that matters isn't the opening itself but travel time, which depends on your area, the hour and the traffic — and should be stated on the phone.
Does a slammed door always open without damage?
Almost always, as long as the key wasn't turned and the deadbolt isn't engaged. The exceptions are reinforced doors, some multi-point locks and mechanisms already damaged. In those cases the professional should warn you before starting anything irreversible.
Will my home insurance cover the opening?
Often partly, through a home-assistance or emergency call-out guarantee — sometimes capped, sometimes conditional on calling a designated platform first. Check before you call: some policies won't reimburse work commissioned outside their network, even with an invoice.
Can the locksmith open up without checking I live there?
They shouldn't. A professional asks for proof of address or ID before opening. If no document is requested from you, the same absence of checks would apply to your door when you're not home.
What we do
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