Some doors are locked because you’re supposed to find the key. Others are locked because you’re supposed to walk past.

Not every obstacle is a test. Some are there to be worked at, and the effort of getting through is the whole point, and some are just the world saying this one is not for you. Treating the second kind like the first turns persistence into wasted years. Telling them apart is the actual skill.

A rough guide: if the door has opened for people roughly like you, it probably has a key. If you are the only one still standing there, and no part of it is getting easier, try the next corridor. Walking past something is allowed and is not the same as quitting.