SHARK TANK - "Episode 312" - The Sharks start a feeding frenzy for a chance to go into the residential lock business with a man from Orlando, FL who invented a way to incorporate the common key into a mobile phone. Two fitness trainers from Medina, OH hope to convince the Sharks their home gym is better since it provides nitrogen gas-pressured resistance. A young man from Trophy Club, TX asks the Sharks to invest in his age-defying products that were inspired by his older girlfriend. A father from Charlotte, NC designed a 100% recycled sneaker and hopes to get a business deal that he can eventually pass on to his two young sons. Also, a follow-up on Daymond and Mark's Season 3 investment with Alashe Nelson from Miami, FL and his EZ VIP website - where you can buy VIP treatment at nightclubs and special events. Daymond introduces Alashe to Pit Bull, the international superstar who will endorse the business, on the Season Finale of "Shark Tank," FRIDAY, MAY 18 (8:00-9:01 p.m., ET) on the ABC Television Network. (ABC/RICHARD CARTWRIGHT) KEVIN O'LEARY, BARBARA CORCORAN, ROBERT HERJAVEC