If LockDoc's great advice doesn't get the door locked.
You probably don't have the correct key.
You could go replace Doors locks with something like in the links below.
These kits are keyed alike.
You could replace the doors and possibly changed the ignition out later.
https://www.brotherstrucks.com/67-72...tinfo/JDLG200/
or this set includes glove box lock keyed the same.
https://www.brotherstrucks.com/67-72...tinfo/JDLGB00/
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The early bird gets the worm,
But the second mouse gets the cheese
84 Chevy K-20
63 Impala (my high school car)
http://67-72chevytrucks.com/vboard/s...Crew Cab Build