Smart devices have invaded our homes the past few years, giving us the ability to control everything from lights to the thermostat with the swipe of an app. But the front door was largely ignored. That changed this year with such products as the August Smart Lock (shown) [$199, august.com], which senses when you are at the door – via a low-energy Bluetooth signal from your phone – and automatically unlocks. There's also the Kwikset Kevo [$219; kwikset.com], which requires just a simple tap of your finger for keyless entry (provided your phone is in your pocket), and the Lockitron [$179; lockitron.com], which easily installs right over your current setup and lets you double-check that your door is locked from anywhere in the world. They're smarter, safer, and far more convenient thanks to the ability to grant friends, or even the electrician, access by sending a time-sensitive digital "key" to anyone's phone. It's an update we've been waiting for, and it means the days of leaving a spare key under the mat are officially over.