Sometimes it does seem that they've held a meeting and taken a vote. The flock seems to have a single mind where they all decide to do the same thing.
I have one flock with their own coop in the main run, and another sub-flock of just four hens with their own coop. These four were separated this summer when they decided they were going to go on a rampage and bully everyone.
Anyway, the main flock of thirteen hardly ever venture into their coop during the day, except to lay eggs. The four in the other flock can often be found hanging out in the coop, doing nothing at all for several hours. Sometimes I think they're inside because it's so miserably cold, but they've done this on mild days, too.
Who really knows? But I would leave their door open, if I were you, just in case they want to change their minds.