"Do I hear the sound of a jail door closing?"

The jail door was open this time, and after search him, they let him into Allison's cell.

Instead he just lay there, using his spark again, only this time heating up the metal inside the lock of the jail door.

When the jail door shut on him, the jailer said, "Did you see the other one?

And he pointed to the jail door and said, "Open the gates."

Later, Britten is visited by himself from the "green reality" who leads him to the jail door.

It's the third turning on the left hand from the jail doors, that's the way we must go.

Two of the 4 jail doors are still present.

Finally Atticus returned, switched off the light above the jail door, and picked up his chair.

I'll be glad to see the jail doors lock on you.