I can't get the key to the Torture chamber in the Thalmor Embassy chest to work. I have two copies of the key -- is there a way I'm supposed to use them? At first I discovered I didn't pick up the books with the key and so went back and got them, but it still wouldn't work. Then I tried to use the "unlock" cheat -- it *says* it unlocked, and the prompt changes to "open door," but when I press E nothing happens. Getting pretty frustrated here. What am I missing?