I recently went on a date and had to explain to the waiter that we are old, and it's going to take us a while. Which was funny, but I don't have a QR reader on my phone, and I wasn't going to haphazardly install something at a restaurant just to see the whiskey menu.
Luckily, my non-technical date had a mainstream phone that came with a QR reader. Using it redirected her to a word doc hosted on a google drive. And there was no link to this word doc on the restaurants official website.
If you're going to do QR codes, the menu should be available from the website, there should be a printed url under the QR code, and it should be an actual webpage. Preferably lightweight static html.