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keep the wolf from the door 

have enough money to avert hunger or starvation (used hyperbolically).
"I work part-time to pay the mortgage and keep the wolf from the door"

door-locked-from-the-inside situation 

a situation where having solved the problem is a prerequisite for solving it.

it is a problem where a solution exists, but access to it is blocked by the problem itself
this is an execution-based form of a circular reasoning paradox
Buying a package of scissors which need scissors to be opened is a door-locked-from-the-inside situation.

I like it hanging from the doorknob

When you hang a sock on the door knob it lets people know that you are doing something freaky inside, you know something sexual.
Ladies and Boys bored out of your mind "I like it hanging from the doorknob" Tie a Toy Sexual Strap On to a Doorknob for Hours of Fun !