Amazon Key, the delivery service that uses a smart lock inside your front door, is expanding to work with five more smart locks. The three newly supported models from Kwikset include two with touchpads and backup keyway, and one that includes a touchpad and no keyway whatsoever. The two models with keyways are called the SmartCode 916 and SmartCode 916 Contemporary, and the keyway-less model is called the Obsidian. Yale’s two newly supported models include one with a button pad and keyway, called the Assure 216, and one with a touchpad and no keyway, called the Assure 256. The new models offer more style options for homeowners, which is important for something that goes on the front door.