Most consumer-grade locks aren’t that secure. To wit, if you ever need to open a basic padlock or combination lock without a key, all you need is a soda can, a boxcutter, and a little precise cutting.

The best padlocks keep your possessions safe in the same way the best bike locks do. That is, they’re great thief deterrents. But they can also ensure the well-being of your loved ones, especially the ...