From right doing, right work naturally flows. It is understandable if one has had to keep working at a fast-food place to help support one's children, but one must also keep an eye out for a better livelihood, as fast-food places poison the population.
In general few jobs meet this principle, as the world system has grown toward wage slavery to enrich those already rich, to most of whom the prospect of such enrichment doing harm to the population is of little or no concern.
It can be helpful to learn a craft or trade that may provide safe and nutritious food, clean water, goods or services that are as free as possible of harm through exploitation -- or debt, which is exploitation at one remove (including the system whereby corporate entities prioritize shareholders rather than the good of society and the biosphere).
Here is a list of pre-fossil-fuel-driven occupations, which may serve as a starting point for thoughts about what might constitute right work:
5. Samma-Ajiva — Proper Livelihood. Also called right livelihood. This is a livelihood based on correct action the ethical principal of non-exploitation. The basis of an Ideal society. http://www.buddhanet.net/e-learning/8foldpath.htm