ロッカー
ロッカー · rokkaa · JLPT N2 · noun
cabinet
🔒 lock + -er = locker: a thing that locks up your stuff, like a storage box with a lock
Rokkaa is borrowed from English locker, which is lock plus the -er suffix meaning a thing that does the action. The Japanese ッ and ー just mark the consonant and the long vowel.