My doors locked with the key in the ignition and the engine running recently. I thought, no problem, I will just use my spare key. Apparently, the remote will not work with the engine running. So, I tied unlocking manually. I still couldn't get in. The hood was up, so I disconnected the battery to shut down the engine. I still could not get in.
I didn't know about the antennae trick. I kept trying both door manually without success. Eventually I thought about spraying some silicone lube in the door lock and that did the trick. Apparently, since I never use the manual locks they just froze up over time.
2002 FX4 Bright Red Supercab 4.0 SOHC, manual 5-spd & Tcase, 33" BFG MTs, K&N air filter, Modified air box inlet, Gibson SS cat. back exhaust, Bama flash, Hidden Hitch round receiver, Rear helper air springs, Electric trailer brake controller, Line-X bed liner, WAAG bar with KC lights and Wildernest shell.