I have a bottom locker, just sit down on the floor and open it.
If someone blocks the door ask nicely for them to move, if they don't be a bit more forceful.
i hate teacher's who make the class super boring
I once had a teacher with a boring monotone voice and never implemented fun.
And it was in MATH!
As for the hall thing, well just know how to get by like a loving ninja. My hallways are thin as stuff but I ninja through.