Have Ford 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.
If your confused on what to do now. You have already been charged the full question value. It's now time to compensate the tech that helped you. The only way I can continue to work here and help customers is by getting rated. If your not pleased yet or plan not to rate me. Let me know so I can help more, close the post, or opt out. Please let me know if you are pleased with my help.
Glad your getting it resolved. Sorry you were not pleased with my help.