Electronic
Open only what needs to be opened. Some vehicles allow you to only open the trunk and then locks automatically when closed. For some vehicles, if unlocking remotely and you don't open the door within a certain time, vehicle will lock automatically again. If battery is flat, remember that you can always open the car manually.
Manual
No Damage to Body: If a bunch of keys, make sure other keys don't scratch paintwork. Have a look at the accompanying video for a handy technique on how to easily locate the lock opening and insert the key without damaging the paintwork. Be careful of not breaking the key in the lock because of haste.
Children :
For young children, make sure the child locks for the doors are on.
Forcing Entry :
Some tips on how to gain entry into your OWN vehicle. See WikiHow .