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If you leave it unlocked, it would allow a student to escape into the classroom and hide, maybe? If you lock it, it may block a potential hiding place.
there's a few scenarios I worked out.
1) as you said, a student may need to hide in there to escape death.
2) the hater hides in there and sneak attacks a passing student
3) the hater booby traps the classroom and the traps go off when the students go back the following day.
4) A student goes in to grab something and the hater locks the door behind them, fills it with poisonous gas and kills said student.
5) student goes in to grab something, Hater sets the room on fire.
6) student goes in to grab something, is sneak attacked by the hater.