High-end vehicles are often equipped with a Passive Keyless Entry and Start (PKES) system. These PKES systems allow to unlock and start the vehicle based on the physical proximity of a paired key fob; no user interaction is required.

https://www.esat.kuleuven.be/cosic/fast-furious-and-insecure-passive-keyless-entry-and-start-in-modern-supercars/