This job is hard work, remember to stay hydrated and keep a clear mind by cleaning your room, putting your clothes away and getting a good night's sleep :)
It's a clue, I managed to find the code and what it unlocked last night. If you don't want to figure it out, then you have to... (Spoilers below)
Find the code on the side of the water cooler, next to the battery machine, by lifting up the 'Out of Order' sticky note. Then go to the locker in your bedroom and look down to enter it.