You know you always find a key and never know what that key goes to.so that means there is always a locked door and a missing key .so what do you do when u have a missing key and a locked door. you brake in and you get out what ever you want...i know its the opposite of what you saind but it's the truth.
All this metaphor is losing me and might actually be losing the wonderful point you are making. Usually the lock has to do with how honest you are willing to be with yourself. The vault is a complete history of your past to the present depending how far you are willing to go and what you are willing to face down and do to live with that information and the key usually has to do with taking responsibility for your life and future so that regardless of what you find and are able to put together it actually becomes nullified by your conscious awareness and allows you to start from ground zero or as close to it as you will ever get. See? That wasn't too hard was it?