The more well off ones usually have a connected airport and “fuck-you-money” level security. As someone else mentioned, helicopters are an option, or perhaps boat if they’re by a waterway.

So congratulations, you’ve trapped the community doctors and lawyers, maybe a very well off Grammy or two with limited faculties, but you’ve set off the alarm bells to the true predators of society, who’ve now made it to Madagascar and shut down the ports.