demand will be low for many industries for a while so even if some businesses open back up they wont be anywhere near 100% capacity. businesses hire based on need. Its a ripple effect. More unemployed means less disposable income. retail stores will consolidate and close locations and turn more to online(This was already happening now will be accelerated), many restaurants will close for good(always have been thin margin business to begin with), Air travel wont return to its levels for a longtime, hotels and travel industry related companies , cruiselines, anywhere dependent on large groups of people will have decreased attendance(movie theaters, themeparks, sports and concert venues etc.).
companies will also ramp up automation to be less reliant on workers so they wont be shut down and impacted again by human labor loss so easy.