It's probably like Marcellus Wallace's briefcase in Pulp Fiction. What is behind the door is whatever the reader wants to be behind there. I think it's very likely that Tolkien never decided what was there.
The big question is, was Baldor trying to get in to what was there, or trying to get out away from the Dead Men? If he was trying to get out he went the wrong way. Aragorn manages to get in and out without using the door. Or perhaps the Dead Men surrounded Baldor, forcing him towards the door that he could not open.
There's definitely some treasure in there somewhere. I remember Aragorn telling the spirits of the dead that he was not there to rob them, or something like that.
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But Gwindor answered: 'The doom lies in yourself, not in your name'.
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