Smart Unlock (With Push-Button Start)
WARNING: This page is about a different car, the 2018 Ford EcoSport. However, it is still accessible from the selected car via links, so may be relevant.
The smart unlock feature prevents the doors from electronically locking when a passive key is left inside the vehicle. When the doors are locked and then closed, the interior of the vehicle is scanned for a passive key. If a passive key is detected inside the vehicle when the doors are locked and closed, the doors unlock.
To override the smart unlock feature, lock the doors using the driver door lock cylinder or another programmed passive key.