Poke your tool of choice into the knob and feel around for the button. When you’ve found it, push it; when it clicks, the door should be unlocked. Some door knobs may require you to insert your tool ...

The Smart Knob promises a smarter, more secure deadbolt lock that lets us issue time-limited unlock codes or give trusted visitors a way in. Thanks to some hands-on time here at Engadget Expand, we've ...