If they open only during the busiest times of the day and in the evening, labor productivity will increase. If there are labor shortages, this makes it possible for people to switch jobs. Those working at black firms will flee while those with an uncertain career and future will also try to relocate in order to obtain new jobs.
Since they will move to firms that value them more highly, the economy's overall productivity will increase. This is not only a matter of productivity. Engaging in a job in which they are valued more highly also raises their degree of happiness. In other words, levels of both productivity and happiness rise at the same time, and so will that of TFP.