If you are running the command from inside a folder containing both the game and the keys:
Nintendo Switch firmware updates frequently introduce new master keys. If you are trying to decrypt a brand-new game but your prod.keys were dumped using an older version of Lockpick_RCM, the extraction will fail. Always use the latest version of Lockpick_RCM to ensure you have the necessary keys for current games. hactool prod.keys does not exist
hactool: error: prod.keys does not exist If you are running the command from inside
Once this is done, hactool will automatically find and use this key file whenever you run it from any location. hactool prod.keys does not exist