Post anything about the three keys in here I've found the first two

1: The first key is in the unlocked dorm room inside the locked desk noclip inside and get the key

2: To find the 2nd key go to the command room head to the right corner from the way you went in there will be a vent you need to head down it and after a while it should teleport you to a dark room next to the desk there should be a locked box you can just noclip inside and get the key.

As for the last one I currently have no clue where it is so any help would be appreciated