As Chris, there is small key on the table in the east storeroom.
Hey, the spot where you get broken flamethrower, the room with the compactor that has a ladder, where the little lift carries the big box to.... the hard to find item is a pistol magazine right by the ladder up top.
If a room is red, you missed something. The game is not broke. You really have to walk inch by inch and spamming
. I am cheering for you and wish I could see your maps to help even more.