When you are storing goods at a self-storage facility the facility operator will have a security program in place that includes fences, controlled access gates, light and cameras. These security measures aren’t cheap, but they can only do so much to stop a thief. To truly stop a thief you need a secure lock.
The most frequent lock used is the basic hardened steel padlock found at the big box and hardware stores. These locks are the least secure and easily broken with a bolt cutter. To keep costs down on these mass produced locks the manufacturer only produces a small number of key combinations. What this means is that the person buying the same lock right after you could have the exact same key. These locks are also easy to pick even for amateurs. This means that theft can go undetected until you re-enter your storage unit weeks or months later. This type of lock belongs on the yard shed, not on your self-storage unit.