I haven't popped a lock in over a decade, but the older Freightliners were easy to get into. Pry the door away from the window with a wedge, start in the center where it's easier and move towards the exterior handle area. Looking straight down, about 2-3 inches in front of the door handle is a nylon bushing between two connecting rods. Hook a coat hanger under that bushing then pull it upwards. The door will pop open.
I paid $150 for locksmith to come out to the middle of nowhere at 1 am. I paid attention and asked him how he got in in less than 10 seconds. He told me, and now I'm sharing that knowledge freely. I've had to pop my lock several times since then, though not recently. I got down to less than a minute to get in. I'm not certain about other makes of trucks, or newer Freightliners.