[Still Thinking]

most need a key to lock them in the first place, and if its an 'auto lock' type mechanism, where were the cameras and duty officers that hafta man the controls ???

In either case, mechanical or electric lock, maybe it was either hazing or he was being a dick and the other guys locked him in there to teach him a lesson.

[Gilbo_3]

note to self...never haze or lock up an armed man in a closet...

also would seem to be a no-no to have live arms in the housing area...