Anel Loubser Lori is right. He will recognize your voice & more likely to respond if no one else is around to frighten him. Sound of treats can also help. I had a cat back in the UK who got herself locked in numerous neighbors garages over the years. Sometimes she'd get out on her own & sometimes I'd be knocking on some stranger's door to ask them to let her out. NEVER learned!!! Nightmare each time it happened. Hope you find him soon.