Unlocking doors with key has suddenly become problem

[elittleton73]

My dad has a 94 Navajo. The key used to work fine unlocking the doors. He has three different keys and they are all the same. The driver side won't unlock at all with the key, the passenger side will work after playing with it for a while and the back hatch doesn't work.

It seemed to happen overnight. Once the passenger side is unlocked, the power locks work fine. Any advice on fixing the problem would be greatly appreciated.

The keys turn the ignition fine.

 

[kid_crash]

My locks started sticking a while ago, a quick spray of WD-40 and they were fine.

 

[Potomac30]

I'd use graphite in the locks.

 

[marragtop]

Yep, use the graphite. Much better and lasts longer than WD40.