car key (n)

Some modern cars require a thumbprint to unlock the door, instead of a car key.
After a long day at work, Susan frantically searched her bag for her car key, relieved when she finally located it and could start her car for the journey home.
John realized he had locked his keys inside his car when he reached for the door handle, prompting him to call a locksmith to help retrieve the car key and avoid a potentially lengthy delay.
Excited about her new car, Emily proudly showed off her sleek key fob, highlighting the advanced features that allowed her to start the engine remotely and unlock the doors with just a touch.