I am not certain which door you exactly mean. All dungeons have levers at the wall, and a section with two doors. If you pull such a lever, the dungeon is loaded and you have to wait a short time.
Later there are doors that can be picked by theives, with lockpicks or the correct keys. The keyhole is then usually left of the door, and easy to see.
And there is a door in the lowere part of this dungeon, for which you need a crystal. The slot is just right of the door; quite small and easy to overlook.
I hope this helps.
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