Locker help! Someone hacks my locker!?

Unfortunately somone hack my locker.I'm in the 7th grade it it helps not to have a bunch of notebooks hidden by some lock-hacking, goth girl... Help..advice...traps...? I want revenge not to tell the teacher btw......

Forget it. just get a new lock where you are the only one to know the number combination. If you want revenge, invest in a good scary gothic mask and put a mirror behind, so that when the hacker opens it, her face will be replaced by the mask! =p