Locked out

The other day, Karl found the key which fit the lock on my desk drawers at school.
I didn't do anything with it for a few days, but yesterday morning I decided to try out the key.

I put it in the lock on the bottom drawer - it didn't turn.

I put it in the lock on the top drawer - bingo. I locked the drawer.

I turned the key back to unlock - wait - uh oh.

I tried harder to turn the key back - no luck. Lift, wiggle, twist, push, wiggle, shake. No luck.

I gave up for awhile, hoping that if I walked away and tried again in a few minutes, it would turn easily when I retried. No luck.

I got Karl to help me with my drawer. Using his super power skills, he...broke the key in two.

I called the workshop. The handyman came over with some tools. He pried open my drawer. Then he dismantled the lock completely, since it was now broken anyway.
Now there is just a hole where a lock used to be.