2. Ask for extra work and responsibilities
Before going to ask for a raise, a more positive approach is to ask for extra work and responsibility, which you can link to a pay rise, if not now then in the future, This is a grown-up approach that employers respond to better than simply asking for more pay for doing the same job.
Another good approach is to ask for a performance related bonus or pay increase subject to achieving more, based on standards or output greater than current or expected levels.