Hey all. Apologies for the silly question. But in the very first room, I kill the zombies to get the key. I can see it in the inventory. Yet when I try to open either of the doors, it says it is locked. I noted in the information about the key that the door should open automatically. Have I run into a bug?

Is the door at X 700, Y 2300 opening? (This is the door that Dan Simpson's walkthrough says you should open at this point. To get coordinates, mouse over the spot you're interested in and hit L)

That worked. Apologies! I saw the other two doors and assumed the key must be for one of them. Thanks.