I just had a slightly different "locker glitch", although it belongs more in auditory experiences.
I restarted the Wii Scholarship Edition and while tormenting prefects and picking lockers, I heard a lot of banging - as if someone had been stuffed into a locker. in the east wing of the main building.
Every locker got checked (I had to pick for of them) upstairs and down - there wasn't anyone stuffed in any, but I could still hear the banging.
Perhaps the ghost from the girls dormitory attic decided to move...?