Whether your vehicle doors lock automatically or you have to engage them manually, make it a habit of seeing that they are locked immediately after entering your vehicle.
Here is why.
What you are viewing is two suspects being chase and followed by a police helicopter. They crash their own car then stop a vehicle in the intersection and jack the car.
Why would you stop for a masked person?
Why don't you have your doors locked?
Proactive.
They do! But I lock them myself as soon as I get in the car. Car jacking should be impossible to achieve.