[BUG] Hall of Revealed Mysteries: Elder Archive door won't open.

[Arsene Lupin]

After getting the key to the Elder Archives from Grima, you can open the door to the Elder Archives with it--but if you close the door again after opening it, you will no longer be able to open it (or interact with it at all). After encountering this bug once (and getting trapped inside the Archives) I reloaded the autosave and repeated my actions (get key, unlock door, open door, close door) and the bug occurred again.

[Zyxil]

This happened to me, too.  I also did it twice, thinking I was slick to block the priest's view of my pilfering.  It's not necessary, of course.