[bsftcs]

If the lock can be picked it does not sound like you are on your way to the lich. It definitely sounds like you have come up the elevator through the necromantic laboratory and into the library and are trying to get to the lich's secret stash.

To get to the lich (the first time around) you have to go back through the main hall near the entrance, up the stairs and down the hallway to the door with the music emanating from the room behind. One of the keys should work on that door. You cannot pick the lock on that door.