There are so many keys involved in this that I always get confused. And I've played through this area four times now. Very fortunately, other dungeons in the game are not like this. So don't despair.
According to the hint book, to open that northeast door you need a key from the sarcophagus at the end of the passage through the northwest door. Hope that's right. The hint book does not describe the key, though. In any case, you're still missing a key.
The mausoleum key you will need later, on the next level. This key is in a side room off the northeast passage, the one you're having trouble getting into. Look for the secret door.
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