Already his expectant eyes rebuke the unopen door.

A key to an unopened door, the secret of the trees and the plants.

So he asks you if you want to change your mind and pick the other unopened door instead.

Nor could he be sure that other, unopened doors would still be there when he tried to retrace his steps.

It was like being perpetually on the edge of some other sort of experience; like being before an unopened door.

A question is a door and an unopened door is just part of the wall and as long as it's standing it's doing its job.