Its tuff to do anything with the old doors hulsey....the 2x4 on the floor is probably the best unless you want electronics involved.
In that case you could put a local alarm on the door that is monitored via a door contact. That contact could be wired to a local alarm to let you know if someone jimmies the door open or not....it would have to have a selectable on/off switch so you could shut it off while you are using it. That type of system could also be tied into an outside alarm monitoring company who would monitor the system while you are out.
The outside sources would probably put the system in for outside monitoring at no charge if you pay a monthly fee for 2 years or more at 20-30 bucks a month.
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