Everybody should be setting the chain and deadbolt anyways, there's tons of threads of front desks giving people keys to occupied rooms by mistake.

Forbes had him try at a hotel in Manhattan earlier in the week

In fact, Brocious’s break-in trick isn’t quite so straightforward. Testing a standard Onity lock he ordered online, he’s able to easily bypass the card reader and trigger the opening mechanism every time. But on three Onity locks installed on real hotel doors he and I tested at well-known independent and franchise hotels in New York, results were much more mixed: Only one of the three opened, and even that one only worked on the second try, with Brocious taking a break to tweak his software between tests.

His presentation is on his website should anybody need to build one.