It's not clear what specifically is the problem that defines the door as locked in your comment. I'm going to assume it's life circumstances. The problems you have to overcome or sacrifices you have to make to unlock and open the door are part of what makes the corridor behind the door meaningful.

In the lock itself resides the conflict needed to be solved, maybe the non-door path includes things you find valuable and you really are conflicted between two corridors of different values. Maybe family is more important to you than a purposeful career or whatever.