the.com/locker

means A small, lockable compartment — in a gym, school, or workplace — where you stash your stuff and trust a combination or key to keep it yours.

from Straightforward agent-noun formation: 'lock' plus '-er,' meaning simply 'a thing that locks.' It entered English in the 14th–15th century for chests and compartments that could be secured, long before gym lockers existed — the word just patiently waited around for puberty and middle school to give it a real job.