My boyfriend just bought a 1994 F150 long bed truck yesterday, and a couple hours later, we found something odd with it.

If the driver's side door is locked with the key, it can be unlocked with the key, however, if you press the power lock button on the inside of the door to lock it, then shut the door, the key won't unlock it. There's no issue on the passenger side door at all.

In other words, both doors can be locked with the key then unlocked with the key, or can be locked with power lock button and unlocked with the power lock button, but the driver door won't unlock with the key (it'll go in, but won't turn) when locked with the power lock button. Any ideas??