I'm still playing the game myself but I'm a bit further on than you so I can help!
I'm not entirely sure that I remember what puzzle you are talking about. Is it the keypad one? If so then its just a matter a looking at the number scratched on the keypad and then finding a locker with that number which contains the code in a football photo. Code is:Spoiler Alert!1031
If thats not the one then you'll have to jog my memory.
This one I remember. You have to arrange the objects on the table so that they match what you see in the sketch. Look at the shadows on the wall from the objects and it gives you numbers, call the number and it will open the door.
The number to call is: