Make your way to the lockers near the exit - you don't need to remember a pattern or anything.
I'm in front of the lockers bit nothing seems off. What now?
One of the doors should be openable, if not, did you check the tire earlier in the first area?
I did check the tire and found the key, first item I got. Am I missing something or is it possible that I bugged the game somehow?
The key + clue from the barrels will make one of the doors among the lockers clickable/openable. Make sure you have the key equipped.
i finally did it, thank you very much!