If there's a boring part of your job that you dread doing (and every job has boring parts), then figure out a creative way to gamify it by turning it into a game. If safety or quality control isn't an issue, then you might try competing against yourself to do the task in the fastest time possible.
Keep "score" of the number of customers you interact with, the number of customers you can make smile, or the number of times someone says a certain word or phrase. I spoke with a dishwasher who told me he counts every dish he washes and that simply doing that had a calming influence. With a little creativity any task can be made, well, if not exactly fun, at least a little less fun sucking!