A seven-year-old boy has died after being hit by a car while riding a scooter outside his home in Melbourne.The man behind the wheel was a neighbour who stopped at the scene in Melton and was left traumatised by Saad Masud's death.Another neighbour, Mohammed Chowdhury, said he came out and saw the child lying on the street.READ MORE: Unlicenced driver charged after 'hitting and killing man outside comic con'A seven-year-old boy has died after being hit by a car while