Keys taken from a locker in an Amsterdam gym or swimming pool are a targeted loss rather than an accident, because whoever opened that locker also saw everything else in your bag.
Changing rooms are one of the few places where somebody can go through your belongings unhurried and unobserved. Locker locks are simple by design and the busy hours give plenty of cover. When keys disappear here, the assumption should be that they were taken, not dropped.
Why this is worse than losing them in the street
Your bag almost certainly contained something with your address: a bank card, a membership card in your name, a letter, a work pass. Gym memberships in particular carry a registered address, and staff cannot always tell who has been looking at what.
That combination, keys plus address, is the one situation where we recommend changing the cylinder without hesitation.
What to do in the next hour
Tell the reception desk so it goes on record and so any camera footage is preserved while it still exists. Block your cards. Then arrange a cylinder change for your front door, and if the same ring opened a shared entrance or bike store, tell the building administrator today.
The cylinder change itself is quick and leaves the door untouched. It is standard work, described on our locksmith services page.
Lockers and what actually protects them
Bring your own padlock where the locker takes one, and choose a closed shackle model so there is nothing for cutters to grip. Where lockers use a coin mechanism, the lock is convenience rather than security, and valuables belong at the desk or at home. Leaving a car key or a house key in a locker for an hour is a bet, and the odds are worse in a large city gym than people assume.
Everything else on that ring
Locker thefts rarely take only house keys. Check what else was on the bunch: a bike key, a locker key for work, a car key, a key to a parent’s house. Each one needs its own decision. The bike is the most urgent after the front door, because a bike parked outside a gym with the key in someone else’s pocket is the easiest thing in Amsterdam to lose next.
What we do at your door
A cylinder change on a standard front door takes about ten minutes and needs no drilling. You get a full set of new keys, and with a certified cylinder a security card as well, so no further copies can be ordered without you. If the same visit needs to cover a storage cage or a bike store, say so on the phone and we bring the parts for both.
Frequently asked questions
More answers are on our locksmith FAQ page.
Should I always change the lock after a locker theft?
Where your address was in the same bag, yes. That is nearly always the case.
How fast can you come?
Usually within 30 minutes, day or night.
Does the whole lock need replacing?
No, only the cylinder in almost all cases.
Will the gym cover the cost?
That depends on their terms. Ask, and keep the itemised invoice either way.
What about my bike key on the same ring?
Move the bike if you can, and replace the frame lock. Bikes are the fastest thing to disappear.
Keys taken at the gym today?
Call +31 (0)20 210 1986 for a cylinder change today, or book a time through our contact page.



