I wonder how well this technique would work with the keys to your house... based on say 50 photos of you with your keys dangling, could you reconstruct the key and then 3d print it?
I remember some years back Diebold posted a photo of their key that unlocks voting machines (or ATM?) as part of their marketing material. Hackers were able to copy the key and open up these machines.
That's been done for quite some time now. A single picture is sufficient for single-sided or double-sided cut keys.
One photo could be enough. There was a talk about this two years ago at 29c3. It's only available in German unfortunately (https://www.youtube.com/watch?v=3JK3TO_crc8) Lockpicking has always been a big topic at the conference.