So Does anyone know how to lube the lock assemblies on the 1st gen 4 Doors ?

So yeah the truck has 255g on the odometer still runs like a champ but the doors back doors the lock seems to get stuck and wont shut the door and the driver and the passenger the lock itself you cant open the door with the key and its hard as hell to just open the door with the handle does anyone know how to take the lock assemblies about of the door to grease or do something that could avoid these problems ??

 

Tube of Lock Graphite will help but with that many miles I'm sure the brass tumblers are worn on and you'll need to recode them