If the account is accurate, he didn't have time to lock himself in his truck. These guys were bad people, who I doubt would have backed off.
According to the account they were kicking the truck and trying to open the door. It sounds like he already was locked in the truck. When police arrived, he was outside the truck standing over the “suspects.” I’m not going to cry over the guy charged with murder though, he sounds like a really bad guy and that society would be better served if he was not amongst us. I just can’t figure at waht point deadly force was necessary.