Door hard to open

[Effieman]

Lately my passenger door is getting hard to open. The handle works and seems to unlatch the latch, but it is really hard to pull open sometimes.
The driver side door works just fine. The truck has never been wrecked, so never adjusted...
Does something need to be lubed? Is there a way to make sure the latch is operating fully?
Doesn't seem to be any visible excess wear around hinges or the latch...
Any ideas appreciated.

 

[Doofy]

Hose the hinges and latch mechanism with pb blaster or wd40 and work the door several times to loosen things up. After things loosen up and the solvents evaporate, spray with dry graphite.

 

[Ranger850]

^^^^^+1this. Or white lithium grease. It stays around for a while