My stepson got fired for being late one day (he was a waiter). His ‘manager’ was not professional, and reveled in the firing.
The very next day - doors are chained shut.
Not even the manager knew what was about to happen.
(usually when a place closes, the 5 second clip on the news will show the chained doors - since the managers have door keys.)
in my view there was a calamitous financial problem perhaps trouble with the IRS or health authorities or pending law suit precipitating the closing