Create a function. Functions do specific things, classes are specific things.
Classes often have methods, which are functions that are associated with a particular class, and do things associated with the thing that the class is – but if all you want is to do something, a function is all you need.
Essentially, a class is a way of grouping functions (as methods) and data (as properties) into a logical unit revolving around a certain kind of thing. If you don’t need that grouping, there’s no need to make a class.