Some of us have had the opportunity to visit the firehouse where Lt Ciampo works. In the basement of that firehouse is a door that was used in an apartment building apparently used by a drug dealer to keep the police from breaking in, rather than an intruder.
This solid steel door had SEVERAL Dead Bolts positioned in various places. Plus it had Three heavy duty thick chains attached to the inside of it and the inside floor. Along with several reinforcing steel bars going across it from side to side.
It can be difficult enough to force a steel door with one dead bolt, let alone several. Plus three heavy duty chains attached at various points in the door going to the floor. Particularly during some heavy smoke conditions where no signs of such security points would be visible from the outside of that door.
This was NOT a "commercial training door", but a door where there actually was a fire and encountered by this fire company. It was used to keep the police out.