But for what purpose?
The purpose of the QR code, as practiced in China, is to track you and give you permission to travel or not. Everything they are proposing along these lines in the west are soft-sells towards that same eventual purpose.
In a video I saw, when you scan your phone, the entire screen either lights up in green or red in accordance to your permission to go through that gate and can be seen from a distance so an officer doesn’t have to be right next to you.
I think the long-term is locking everybody in so they can round us up at their leisure to reduce the population to between 500 million and a billion.