Ninth already said 'locked', and I'd say to concentrate hard on this one. 'It's stuck/closed' or 'I can't open it' must be the most common phrases in the whole videogame universe. I also remember some AG character always asking 'Why should I do that?' and someone else saying 'That would cause a lot of harm' but I can't remember which game it was.
But surely 'I'm not putting my mouth on that' (FT) was one of a kind