When I was a boy our town had a large oil refinery. Not a gate or fence in sight. We could enter the refinery pretty much at will, and while exotically dangerous (oil refineries are pretty dangerous things) it was perfectly legal and usually undetected, let alone reported.
Things are a lot different now, especially since 9-11.
I lived in the Baytown area for over fifty years and this is the first lockdown I’ve heard of happening at the ExxonMobil refinery.