When they were back to work, the doors were closed until all of them arrived, as he was emphasizing he had the upper hand. It is explained "that they were not sulking, that their mouths had been closed, they had to take it or leave it, and that anger and helplessness sometimes hurt so much that you can't even cry out."
The speaker emphasizes that the group waited until everyone was present before opening the doors, highlighting his authority. It is also explained "that they weren't pouting, their mouths were sealed, they had no choice but to accept or reject, and that feeling helpless can be so overwhelming that you're unable to express your emotions."