Plenty of Canadian provinces have had lockdowns, as have many other places in the world. This article details how they were implemented and enforced in Ontario: https://news.ontario.ca/en/release/61192/ontario-strengthens...

Some of those restrictions are stricter than any in Australia have been. And, as per the article, they're being actively enforced by the police, same as Australia. The military isn't doing that kind of enforcement in Australia.