If you're riddled with the virus, the lockdown to get rid of it will take a fair bit longer than a fortnight to completely halt transmission. Intra-household spread and high risk essential workplaces will ensure that transmission continues for some time, even after nobody is having much contact with anyone else.
And if you're in the United States, the world's virus epicentre, the horse has well and truly bolted on the border thing. It looks like you're in Sweden, the same is probably true there, since there's more virus there than in many of their neighbouring countries.