As a genre exercise, I enjoyed it a lot.

Filmmaker David Yarovesky and writer Michael Arlen Ross have lots of tricks up their sleeves, including arguments about Marx and Dostoyevsky, not to mention actors who don't need to be in the same space to raise gooseflesh.

A film like “Locked” lives and dies by its ability to entertain us with images of a man banging on tinted windows for help while he faces the prospect of being hurled off the roof of a parking garage. And on that, it delivers.

Its angle on social warfare is muddled and unconvincing.