To find the Burger 66 Locker Key needed to open the Burger 66 Staff Locker in Dead Island 2, make your way to the southern part of the map as shown below.
Once there, look for the Burger 66 Server! Take him down then collect the Burger 66 Locker Key he drops.
Next, make your way over to Burger 66!
Once inside, head to the back room and use the Burger 66 Locker Key to open the Burger 66 Staff Locker! For more guides on Dead Island 2, click here!