JOBS WHITE PEOPLE WON'T DO:

Foreign construction workers like Hoang are becoming a familiar sight in Japan. Like other industries in a rapidly aging Japan, the construction business is desperate for labor. A third of the country's construction workers are 55 or older, with those aged 29 or younger totaling just 11%. As baby boomers retire, the labor shortage -- in construction and in the wider economy -- is bound to become more acute.

The demand for construction workers is intensifying before the 2020 Olympics, and Hoang is one of the 274,000 foreign workers in Japan on a government-backed trainee program that has become a back door for foreign unskilled workers who would otherwise not be allowed in. Started in 1993, the program has boomed in recent years -- and is one reason that the number of foreign workers in Japan has nearly quadrupled over the last decade.

Led by an influx of workers from China, Vietnam and the Philippines, Japan is in the midst of a quiet revolution when it comes to immigrant workers. Though the total number of foreign workers in Japan is small compared to the more than 3 million in the U.K. and Germany, it is catching up rapidly -- a remarkable shift for a nation famous for resistance to immigration.

Without fanfare, Prime Minister Shinzo Abe has steadily loosened Japan's once tightly controlled visa policy, resulting in an almost doubling of the number of foreign workers in Japan to 1.28 million over the last five years. In its latest move, Abe's government is expected to create a new class of  five-year work permits for unskilled workers in hopes of attracting more than 500,000 new overseas workers by 2025. The new guidelines, to be finalized in June, will ease language requirements for foreign workers in construction, agriculture, elderly care and other sectors that are suffering the most serious labor shortages. It will also be possible for trainees to extend their stay for up to 10 years.

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