Don't worry, the combination is written on it.
From Vent, Enter, Search, a blog for firefighters about hazards and unusual situations encountered on the job. Much of what's documented is epic kludge that may also put firefighters in danger when trying to enter or exit a building.
Oh yeah... I used it as a lock in the bathroom.
So I guess it's a locket wrench now.
"Don't be an idiot," they said.