Reviewing basics is what keeps us up to speed. If possible, make a small door, frame and all, with several different locks on it. Then all members can visually see exactly what you are talking about when you discuss forcible entry. We all know that we don't get enough fire ground work. Well here's one way to solve that problem.
Good evening Brian D. You can try to get a door off a vacant or one that a home depot may be unable to sell because of defects. Then just cut it down to say 3'x3', then it's good to go. Locks from old bldgs or fires. Good luck with it and Stay Safe Bro. Mike