I had the passenger door open. I wanted to remote start it. I hit the lock button on the remote, then held down the start button. I got to chatting and knowing that the truck will turn itself off, I reached across and put the keys in the ignition. Once I was done talking, I closed the passenger door to walk around and the truck was still locked. Because I never hit the unlock button, all doors were locked with truck running. The worst part is that I've done this before. Only the second time, I happened to have my wife's key for her vehicle in my hand so when I went to close the passenger door, I knew it was locked but in a moment of pure genius, I forgot I had put the keys in the ignition and thought the key in my hand was for the truck. It obviously wasn't.