Anti theft?

[Shifty One]

My passenger door doesn't like my key about 50% of the time, so when opening the door for my wife, I have to run around to the driver door, pop the power door lock, run back, and open it for her.

The other day, she needed a ride to the mailbox on my way to work. The key did the usual, and didn't work. She got in the driver's side, and slid over.

Ever since that day, my driver's door won't open from the inside, so I have to roll the window down, open it from the outside handle, and roll the window back up.

Is this an anti-theft thing? (1998 C2500)