According to the latest job report on November 2, 2018: As of October of 2018, over 5 million people in the United States currently want a job in contrast to 4.9 million in October of 2017. Over 8 million people in the United States are multiple jobholders, vs 7.4 million last year. 2.18 million have both primary and secondary part time jobs, as opposed to 1.77 million last year.
Part time jobs are unlikely to have benefits. A full time and second part time job generally means that the full time job doesn’t pay enough to make ends meet. There are more full time workers with a secondary part time job, as well. 5.2% of workers are multiple jobholders this year vs. 4.8% last year.
See related statistics here: https://miningawareness.wordpress.com/2018/11/06/senator-ted-cruz-proposed-increasing-h1b-immigrants-500-h1b-visas-will-lead-to-even-greater-immigration-crisis-us-born-more-likely-unemployed-than-foreign-born-says-latest-employment-data/