Moving into a new apartment already comes with a long checklist. Locks are easy to overlook because the door may appear to work normally. However, a working lock does not necessarily tell you who may still have an old copy of the key.

This is especially relevant when moving into a rental unit or a property that has had several previous occupants.

1. Ask Whether the Lock Was Rekeyed

Find out whether the lock cylinder was rekeyed after the previous occupant moved out. If the answer is unclear, speak with the property owner or manager before making changes yourself.

2. Test Every Exterior Key

A key should enter and turn smoothly. If it requires excessive force, feels bent, or repeatedly sticks, the key or lock may need attention.

3. Check Whether the Door Closes Correctly

Sometimes the lock is not the real problem. A door that has shifted can place pressure on the latch or deadbolt and make the lock difficult to operate.

4. Look at Secondary Entrances

Back doors, basement entrances, storage spaces, shared areas, and garage doors may use completely different locks. These access points should not be overlooked when reviewing a property's security.

5. Avoid Forcing a Lock That Feels Wrong

Forcing a stiff key can turn a minor lock problem into a broken-key extraction or damaged cylinder. If resistance is increasing, have the hardware inspected instead of continuing to force it.

Tip: If you rent, check with your landlord or property manager before replacing or modifying lock hardware.