Answer:
A locked door can symbolize opportunities that you have not worked towards yet, or opportunities that you haven't been able to achieve. Or, a goal you haven't been able to achieve.
Explanation:
A locked door. Locked doors are doors that need a key to be unlocked, right? So, if the opportunities/goals that you have are behind that door, you need the "key", which is the hard work and effort you put into achieving that goal.
Read that book last year and not sure if I remember 100% correctly but I think George teased him and would call him names associated with being dumb.
The word "something" should be replaced with precise language.
Good luck!
