Hazell Sepulveda locks the door before leaving for the boder in Tijuana, Mexico, Jan. 11, 2018. Hazell Sepulveda, 26, was born in San Diego to Mexican parents, and she resides in Tijuana now. It takes her five minutes to cross the Otay crossing point before dawn every day before working at the kitchen of a McDonald's just 500 steps from the border. A long and well-guarded fence with just three gateways divides the two cities, a market of 6.5 million people and an economy that generates 230 billion U.S. dollars a year, according to Mexico's Foreign Ministry.(Xinhua/Xu Rui)