Vault 81 center door won't open (Fallout 4)

I found shelter 81, entered it, talked to the caretaker, and he let me in. After a second conversation with the caretaker, but only in the hall of the shelter, she allowed me to go to the residents (well, where everyone lives). He walked over the slabs on the floor that make a sound but the door did not open. Been many times nothing has changed. There was no radiation in me.
What to do and how to open the door?
(Play on Xbox One)