Nothing a few million more criminal aliens could not fill.
A big part of the problem with illegal aliens taking low paying, part time jobs, is that these are entry level jobs, the jobs American youth used to take as a part of learning responsibility and the work ethic.
In my neighborhood, the typical "first job" sort of work at fast food places are all held to people who speak little or no English. At the local Hardees, the people taking orders are at least minimally bi-lingual (their native language is NOT English) and speak to the crew in back in Spanish.
Mark