I am a locksmith, and it can absolutely be done. I knew an auto specialist who once looked in the window of a guys truck and cut a key by visually decoding his key which was laying on the driver’s seat. The entire exchange was less than a minute. Little different, as he was actually looking at the key and copying it, but reading wafers isn’t very difficult. A lot of locksmiths will do a visual read on a pin tumbler cylinder and cut a key in less than 5 minutes. It just takes experience, like anything else.