For older vehicles the doors are locked and unlocked with a keypad on the outside of the door itself.
Automatic mechanical door lock.
This type of lock relies on an electric current to activate the locking mechanism.
Most electronic locks are priced anywhere from 100 300 depending on the number of features and level of security they offer.
Both mechanical and smart locks are available at a range of price points but mechanical deadbolts do tend to be less expensive.
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Automatic door locks work utilizing a central locking system.
Electric deadbolts are automatic door locks equipped with direct throw solenoid driven mortise bolts or a right angle bolt for door frames that are narrower.
Find here online price details of companies selling automatic door lock.
Most newer cars have a remote keyless system that can be controlled remotely with a key fob.