Japan fully reopens to tourists this week after two years of COVID-19 restrictions. However, shuttered shops and a shortage of hospitality workers threaten the country’s hopes for a tourism boom. From Tuesday, Japan will reinstate visa-free travel to dozens of countries, ending some of world’s strictest border controls to slow the spread of COVID-19. Prime Minister Fumio Kishida is counting on tourism to help invigorate the economy and reap some benefits from the yen’s slide to a 24-year low. Japan’s tourism industry has been upended by COVID-19Just over half a million visitors have come to Ja…