Where to find keys in Crimson Desert

Tracking down key locations in Crimson Desert is vital if you're looking to steal items of value, or even open a safe like the Hernand Castle Strongbox, since this is located behind a locked door. Rather than finding specific keys for specific doors, Crimson Desert has a generic system where you can use any key for any lock, provided it's not a specific named one—this only seems to apply to quest-related doors.

For everything else you can use a generic key item, so gaining access to most...