What is documented is that when a pandemic hits, implementation of strict community restrictions on travel and social interaction as well as denying access to public spaces has worked so I see no reason why it would not work with covid. As for covid from what I've read a lockdown has worked in slowing the spread, I would have said stopped however people tend to do as they please even with the lockdown. New Zealand is a good example, the Quarantine stopped the spread until they eased the Quarantine. On 10 feb zero reports then on 8 july 1 reported and on 29 aug 50 reported.