With the smart key

Carrying the smart key, you may lock and unlock the vehicle doors (and liftgate). Also, you may start the vehicle. Refer to the following for more details.
Locking
Pressing the button of the front door handle with all doors closed and any door unlocked, locks all the doors. If all doors and hood are closed, the hazard warning lights will blink once to indicate that all doors are locked.
The button will only operate when the smart key is within 28 ~ 40 inches (0.7 ~ 1 m) from the front door handle. If you want to make sure that a door has locked or not, you should pull the front door handle.
Even though you press the front door handle button, the doors will not lock and the chime will sound for 3 seconds if any of following occur:
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The smart key is in the vehicle.
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The EV button is in the ACC or ON position.
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Any door except the liftgate is open.
Unlocking
Pressing the button of the front door handle with all doors closed and locked, unlocks all the doors. The hazard warning lights blink twice to indicate that all doors are unlocked.
The button will only operate when the smart key is within 28 ~ 40 inches (0.7 ~ 1 m) from the front door handle.
When the smart key is within of 28 ~ 40 inches (0.7 ~ 1 m) from the front door handle, passengers can also open their doors without possession of the smart key.
After pressing the button, the doors will lock automatically unless you open any door within 30 seconds.