Gathering a little stockpile of lockpicks is important in Kingdom Come: Deliverance 2, especially if you want to engage in some nefarious thievery and rob peasants and nobles for all they're worth. This is because the lockpicking minigame is extremely tough, especially if you don't have the adequate skills to reduce its difficulty.
Punching above your weight and trying to open harder chests will snap a lot of your lockpicks, and with Kingdom Come's less than generous save system, it's harder to roll things back—unless you want to drink a Saviour Schnapps before attempting to unlock every chest, that is.
