Is it? In countries with higher minimum wages, McDonald's uses kiosks for ordering. I'm guessing, but it feels like 1/3 of fast food staff mans the registers.
Though in support of your point, when I went to Korea last year there was a large number of automated kiosks, and I know the minimum wage there is fairly high as well. So, Japan's lack of those kiosks may have to do with a preference towards cash/human interaction in the culture.
Around here (Central Europe, Austria, Germany, Italy too IIRC) I don’t see non-kiosk McDonalds anymore, as they went through the kiosk upgrade in the past few years. Noticeably fewer employees.
I would argue that the job losses to automation would've happened anyway without any discussion of wage increases -- kiosks are cheaper than even below-living-wage workers.
Though I was specifically thinking Sweden.