I’m Mentally Exhausted Dealing with Customers at Self-checkouts

I’m a female part-time worker in my 50s. I’ve been working as a cashier at a supermarket for 15 years. With the COVID-19 pandemic, self-checkout machines were introduced that let customers pay for their purchases on their own.

As a result, it’s often the case now that I only oversee the self-checkouts. The work is physically easy but mentally exhausting.

The other day, I pointed out to a customer that they had failed to pay for vegetables because they had not scanned the bar codes. The customer got angry and said they had bought the vegetables at another store.