I parked the car and left it running. I exited the car and left the front door standing open. I unbuckled my children and helped my four year old out of the car. I went back to the driver's door, leaned in with my right knee on the seat, and took out the keys. My left leg was still on the ground outside the vehicle. After a few moments the car started rolling. I was dragged backwards down the driveway and into the street. I was able to brace myself between the door handle and the steering wheel, keeping the door from pushing shut and shoving my leg under the car. This also allowed me to maneuver my right leg off the driver's seat and slam on the brake. I managed to keep my leg from getting caught under the wheel, but it was an extremely near thing. As far as I know at the moment I only have bruising and scrapes/road burn. If I had leaned in with my left leg, been wearing sandals, or lacked upper body strength I would've been unable to stop myself from getting dragged under the car and run over. If my 6 year old had been a bit faster stepping out of the car he would've been knocked over by his door and potentially dragged under as well. We both could have been seriously injured or died if this had gone even slightly differently. I'm extremely lucky and extremely terrified.