I bent a large diameter (8 gauge) copper wire
in the shape of a staple with each bend about an inch high. I haven't finalized the length of the top part of the "staple". One downward end goes into the inside hole where the clasp would close the door from the inside, and the other end goes into the eye where the clasp is attached. This keeps the door open enough to pass by, but gives extra room inside. Very simple, extremely cheap, and no extra holes drilled anywhere. Each door can move a little which is OK for now. I keep it in the toothpaste/brush drawer.
Bob