Find your keys in a a safe, well-lit location such as in your home or in a department store, before heading to your car.
Keep your keys available as you approach your vehicle.
Prepare to use your keys as a weapon if you are assaulted or attacked. By holding the key chain and other keys in the palm of your hand and letting the key that you will use to unlock the door stick out in between your pointer finger and middle finger, you have a weapon for poking someone if necessary.
Remotely unlock only the driver door when near your car.
Take notice of anyone sitting in a car adjacent to your car.
Check underneath and around your car as you approach it.
Check the interior of your vehicle before you open the door and before you unlock the door with a key in the event that you do not have a remote opener. Make sure no one is hiding inside.
Put the key in the door, turn it quickly and get inside. Immediately lock yourself in.