Ford Repair Questions? Ask a Mechanic for Answers ASAP
Welcome, I'm Chris (aka Moose).
This is not uncommon. The lock cylinder back there gets packed full of road grit from the swirling air behind the vehicle and from driving with the tailgate down. Normally you can use compressed air and or spray lube sprayed into the hole to free the key. You need to jiggle the key up and down vertically while taping the key with something hard like screwdriver handle. The tumblers inside are not retracting are stuck inside the valleys of your key causing this. Worst case scenario you remove the cover on the inside of the tailgate and damage the cylinder to knock your key back out.
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