JOBS WHITE PEOPLE WON'T DO:

In Dallas, the King of Texas Roofing Co. says it has turned down $20 million worth of projects in the past two years because it doesn't have enough workers.

In the San Francisco Bay Area, Joe Hargrave is expanding his successful Tacolicious chain of restaurants, but says he is building smaller ones due to "a massive shortage of restaurant workers."

And in Florida, Steve Johnson, who harvests oranges for the citrus industry, says, "Right now, if I had 80 guys, I could put every one of them to work."

As hiring accelerates and the labor market tightens thanks to a steady U.S. recovery, employers who need low-skilled workers are increasingly struggling to fill vacancies. One big reason: Mexican workers, who form the labor backbone of industries like hospitality, construction and agriculture, are in short supply.

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