Movie from 80’s or 90’s. Possibly one of the Corey’s (haim/feldman)  teen girl wants boy to take nude picture of her in boys locker room, ends up getting locked in a locker by coach/teacher. “Always remember to lock your locker” or something like that was the line said to boy as he stands with mouth agape while. La h slams door and spins lock dial. Nude girl in locker gets found by “lucky” gym student after next class.