Open
One account lets the holder into the Empty Gallery. At last, perhaps, they can approach the seats from which they have felt watched.
Closed
Another locks the imagined audience outside. The same little object offers privacy instead of admission.
No door
A third teller has no use for either action. There was never a door. There is no confirmed lock, and the eye-shaped bow on many replicas is probably a later decoration.
Judgement, the Empty Gallery and the Shielded Asking gather around this probable invention. An ordinary key can prompt someone to notice whose opinion they want to reach, escape or stop carrying. Its weight in the hand cannot establish that hidden observers exist.
Put it beside the cards if the story helps. The audience may become easier to describe even while the lock remains unfound.