The airplane pictured is a Cessna 182E. Though difficult to get yourself out the door in flight, if you worked at it you could. The open door will stream 4 to 6 inches open, being more difficult to close or open more. However, if a person forced themselves out the door and made it part way out, pulling them back in would be extremely difficult, as the streamlining door would pinch on them. I would estimate that a person whose torso was mostly out the door would be near impossible to pull back in, even if they wanted back in. I speak this as a former jump pilot in many types of Cessnas. Once a jumper is part way out, they're not coming back in. and that's with a jump door, as opposed to a regular door. There would be no way that the pilot or other passenger could have made a better outcome once the passenger was part way out the door.