iirc there are only 2 of them.put your ear close to the door.if you don't hear anything,they're probably asleep,it's time to go in.press enter,open the door,use your movement to enter the room a little.you can catch the key from a distance,you just need to see it.now,it's time to go out.2 possibilities:use the tbm trick again or just run to the end of the corridor on the left.
two different things can happen:
-one terror follows you but if you are quick enough and maximum left she will get stuck in front of the key room.you can even kill her with a level one team.
-or even simpler,she stays in the room and the light will become green again after a while.