May I "Hypop-ethize" that:
The Popper is a mechanism used to remove the Lid, thus revealing the desired contents of the container.
The original phrase, "...appeal as any pop to his lid" would then indicate that this [hallway] was a suitable means to the desired effect; that is, a refuge.

If I am way off-base, tell me. (But be polite )

"I am certain there is too much certainty in the world" -Michael Crichton