Commentary America faces a labor shortage. Some 3 million job openings remain unfilled. The labor force—those working or actively seeking work—remains 5.5 million short of pre-pandemic levels. The worker shortage is slowing the pace of the recovery. Though the teeming mass of asylum seekers at the southern border might seem to offer a solution, it is doubtful in this matter that immigration can help much. But there is also another, more fundamental labor shortage developing. It is demographic in origin. Decades of low birth rates have left a dearth of young workers to take the place of retiring baby boomers. Immigration can help in this important long-term matter, but only if Washington can do what it has failed to do for decades—reform the nation’s immigration system. The immediate labor problem is a legacy of the pandemic. Many, for fear of infection, have avoided the workplace. No statistics exist on how …