It wouldn't be until January anyway.
To be cynical, Democrats might not do much at all. With a vaccine (hopefully) being given out, and staying indoors a more popular option (due to winter), new infections will likely be on a downward trend, and deaths very low too.
A 2-week lockdown is intended to stamp the virus right out? Or at least reduce it to clusters that can be tracked and tested all around? I feel like the time for that has passed. It's a big imposition which would probably only "reset" virus levels, which would then come back up. And to achieve the level of success Australia or particulary New Zealand have had, it would need to be more widely obeyed than I think likely in the US. Being mostly one huge expanse of country with a big population works against it too: apparently US states can't close their borders, and in any case California has a bigger population than Australia and NZ combined.