PITTSBURGH (CBS) — Microchip implants are a popular way to keep track of pets, but now some people are getting them implanted in hopes of improving their lives. The microchips can help unlock doors or log into a cell phone. Tim Shank uses it to open his front door and manipulate his smartphone. “It turned off my ringer,” Shank said. Krissy Heishman uses hers instead of a key card at work. “It’s just like a little glass bead about the size of a tiny grain of rice,” Heishman sa