Infinite Golden Keys:

Note:This procedure involves editing a game file; create a backup copy of the file before proceeding. Use a text editor to edit the "WillowDLC.ini" file in the "\Steam\steamapps\common\Borderlands 2\DLC\POPremierClub\Lic" folder. Locate the following lines:

[GoldenKeys]
+SourceId=254
+NumKeys=1

Change the "+Numkeys=1" value from "1" up to "255" to get the desired number of Golden Keys. The Golden Keys can be used to open the Golden Loot chest found in Sanctuary near the Fast Travel terminal. Each time you open the chest, it will use one key and give you rare weapon(s) or item(s) that are scaled to the current level you are at when you open the chest. Note: This glitch was done on an unpatched version of the game.