All doors open.
Some doors require a rare key. Find one.
Others have smaller-than-average frames. Squeeze through.
Many are gated, screened or guarded. Prove yourself.
Oftentimes, you just need to jiggle the handle and give it a little pressure.
Ask Roger Bannister, who shocked the world in 1954 by becoming the first man to run a mile in under four minutes. These days, even teenagers have been known to open that door.
A successful example is a permission granted.
If others have done it, why not you?