This mod is for anyone experiencing the glitch where the vault door will not open, no matter what. This mod works around the problem by creating a small door next to the locker in the main room where the vault door controls are. The door will teleport you to the other side of the vault door. If you want to return for the Cryolator weapon, another small door under the stairs leading to the main vault door can get you back in.
Update: This issue should have been fixed in the next-gen update, so hopefully you won’t need this mod. I will keep this mod up forever just in case anyone has any pre-existing saves where it won’t work.