Stories like these make me want to invest in a ballistic resistant door.
A really Big One!
Then install the door yourself without attracting anyone’s attention if at all possible as some places don’t allow such doors.
https://m.youtube.com/watch?v=mkWJ3wUd5u8
Folks in Alaska install anti bear doors. A side benefit is swat denial. LOL. So much for the element of surprise...
Or some Claymores.
Get a heavy wood door with a heavy-duty double-bolt system, that locks both on the side of the knob, as well as top and bottom. Obviously, also make sure the frame is sufficiently strengthened.
What you would need is an Area Denial System. A quick and dirty set up would be a cargo net used to keep stuff in the bed of a truck. The anchor points would have to be anchored in wall studs surrounding the door but not in the door frame and probably using heavy duty hooks. The net in effect would hang in a vertical anchored position but set just loosely enough that removal is easy from the inside in case of fire.
Any attempts at penetration short of a vehicle battering ram or explosives would at best take the door off its hinges but it would be caught by the net and still stop entry until the net is cut through. No more surprise allowing a evac from another point or arming up to resist.