Toyota prius Owner's Manual page 74

1-3. Opening, closing and locking the doors
Unlocking and locking the doors
Front door handles (including front passenger door handle if
equipped with entry function)
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PRIUS_OM_OM47871E_(EE)
Grip the handle to unlock the
doors.
Make sure to touch the sensor on
the back of the handle.
The doors cannot be unlocked for
3 seconds after the doors are
locked.
Touch the lock sensor (the
indentation on the upper part of
the door handle) to lock the
doors.
Check to see that all the side
doors and back door are securely
locked.