Hello! When it comes to locks for storage units, there are several options to consider. One popular choice is a disc lock, which is known for its durability and resistance to picking. Another option is a padlock, which can be used with a hasp or latch system. Combination locks are also commonly used, providing convenience without the need for keys. Ultimately, the best type of lock for a storage unit depends on factors such as the level of security required, the type of storage unit, and personal preference.