Quest \ "Zakutok \" help (Fallout 4)

Good day! Help me please. With the passage of the quest "Zakutok". In honey. block after talking with the doctors, we need to move after Bobby. Which leads to a room with a working reactor, where he will open a secret door. Bobby went to the wall, knocked it open. I took a step back, the wall closed. Now I can not get into the secret part of the Vault. How to get there?