钥匙

Does the key fit the lock?

Each locker has its own individual key.

skeleton/master key

latch key

three-toothed key

the spare key to the front door

room/house key; key to a room/house

swipe/key card

key to a safe

key card; card key

turn a key in a lock

duplicate/cut/make a key; get/have a key cut

insert/put the key in the lock

remove the key; take out the key

a set of car keys

a bunch/cluster/set of keys

a key