“That’s not my job” is sometimes technically true and almost always quietly expensive.

Duties and reputation are not measured by the same people. Every workplace runs on tasks that belong to nobody in particular, and whoever picks them up becomes the person who gets asked and trusted. Declining those tasks protects an hour and costs you a reputation that was being built in the background.

Next shift, do one small thing outside your remit without mentioning it. Keep the line for genuine overload or safety, and say it plainly then. Notice who in your workplace never refuses that kind of task, and how people talk about them.