Toyota 2012 Prius Owner's Manual page 139

1-4. Opening, closing and locking the doors
Back door (vehicles with entry function of front and back doors)
110
PRIUS PHV_OM_OM47818U_(U)
Press the unlock button to
unlock all the doors.
The doors cannot be unlocked for
3 seconds after the doors are
locked.
Press the lock button to lock all
the doors.