Most newer cars have a remote keyless system that can be controlled remotely with a key fob.
Automatic mechanical door lock.
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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For older vehicles the doors are locked and unlocked with a keypad on the outside of the door itself.
Most electronic locks are priced anywhere from 100 300 depending on the number of features and level of security they offer.
On some cars the doors lock when the transmission is moved from the park position.
Find here online price details of companies selling automatic door lock.
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.