I really doubt there is a fix for this, but I will ask anyway.
So, I did this quest all the way untill the part that I had to take the Infinium, then I left that place without the book. I planned to wait till Serana got back from Falion, for rp reasons. When I got back to the Outpost, the Dwemer Lockbox was closed and I couldn't go inside it, but my weapons and magic go through the "door". Is there any way to open it again? (While I doubt it, there may be a way) And please don't ask if I have a save from before it happened, beacause I don't. And console commands won't work, since I play on the PS3.