My 84 K5 Blazer does the same thing now and again. Mine unlocks easily when I pull the door towards me when its in the closed position. But won't open any other way w/power lock or the key. My dad had a 79 ton no power in the doors and the lock assembly completely locked up and could not open the door. Very unsafe situation IMO.
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New daily driver 96 Chevy K3500 crew cab dually 53,000 miles 350 Vortec 4L80
Nice ride 67 Chevy C-10 LWB Built 350 TH-400
Wifes ride and family rig:
2001 Furd Expedition 5.4 Liter 
Kickin back in Rolla,Mo. USA
"Do the thing you fear most and the death of fear is certain" Mark Twain
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