Illegal or not they are working….
Check it out:

The number of foreign-born individuals holding jobs in the United States hit a record high of 25,019,000 in September, according to data from the Bureau of Labor Statistics (BLS).

The BLS has been tracking the number of foreign-born workers annually since 2005 and monthly since 2007. The BLS does not distinguish between foreign-born individuals who are in the United States legally and those who are here illegally.