>>64067030
If not a steel security door (will require framework) then get a solid interior door and put a tracked (not rolling) accordion gate in front of it, drilled into the foundation. I'd also put something over that window over there, I don't care how solid it is, put a metal screen or bars over it. If I find a door inside your house with any level of security and put 2 and 2 together on that window leading to the same room, I'm breaking in.