Remember that scene in Age of Ultron where all of the unworthy Avengers tried lift Thor's hammer and Tony Stark accused Thor of having a thumbprint scanner? YouTube user, Sufficiently Advanced, has created that thumbprint scanning Mjolnir just like Stark suspected.
In the video below, the tech-genius places his electromagnetic Mjolnir on metal surfaces around California and encourages passers by to attempt lifting it. When they're unable, he tells them they're not worthy, then lifts the hammer himself after a quick thumb print. Some were bright enough to catch on but even when they do, they have to admit it's a pretty creative trick!
It's safe to say, Sufficiently Advanced is worthy of a subscription.