CK5 - The Full-Size GM Off Road Community

How do you lock the rear barn doors .I tried the key and it only turns one way and the door still is unlocked . can it be locked from the inside some how ?

if you pull off the door panel theres an inspection hole in the steel i cut a hole in my vinyl so i can get out from the rear doors,it can be locked and unlocked from the inside.(by sliding the rod up or down,and opened by pulling the flat steel part like older vans) if the lock cylinder is spinning you might want to press the keeper in more or need a new lock pawl and some lithium grease.
hope that helped.
if its none of that you may need to adjust the catchs on the top and bottoms of the door jams out some.
goodluck

I will try that .thanks