From July 2019, unmanned sales at midnight will be started experimentally as a measure against serious labor shortages at two stores including franchisee store for two months.
In this experiment, it is assumed that there are no clerks at the cash register for 5 hours from midnight 0:00 to 5:00 early morning. Customers registered in advance to the dedicated app can open the door to enter by reading the QR code displayed on the app at the store entrance. Products will be sold as normal, except for the products and services that clerks need, such as cigarettes and liquor, counter fast foods, stamps, payment and ticketing services.

https://www.lawson.co.jp/company/news/detail/1369017_2504.html