This Lockpicking guide will show you the fastest way how to get your Lockpicking skill up from 1 to 300
The basic formula for your maximum lockpicking skill at a particular level is (5 * level).
Click on the links below in the guide to see the exact location of all of these chests/lockboxes.
1 - 100
The Buccaneer's Strongboxes located on a ship near Rachet in The Barrens respawn after a few seconds, so even two rogues can skill up there at the same time without trouble.
There's another chest on the bottom fo the ship called "The Jewel of the Southsea". Don't try to open this if you are low level, because it will spawn a mob that will kill you.
There are a bunch of Practice Lockboxes in Redridge Mountains north from Lake Everstill. These respawn really fast, so skilling up to 100 will be really easy.
100 - 150
Go to Zoram Strand in Ashenvale and look for Waterlogged Footlockers along the shore (on land).
150 - 200
Go to Badlands - Angor Fortress. You will find two kinds of footlockers there, you will need a lockpicking skill of 175 to open the Dentened Footlocker. Don't bother trying to Pick Pocket the mobs, the boxes are too low level and they won't give any skill points.
200 - 250
Go to the middle Searing Gorge and go inside the cave called The Slag Pit, you will find a bunch of footlockers there. You should also try to Pick Pocket mobs to try to get a few Sturdy Junkbox.
Stay on the lower part of the Slag Pit until you reach 225 because you can't open the lockboxes at the upper part yet.
250 - 300
You can level the last 50 point in the Blackrock Depths (BRD) dungeon. Simply go in, turn to the left and unlock the first door, then take the first right, open the next door. Go left and pick the first door. Go through the door and pick the large wooden object sticking out of the ground below the giant gear.
Once you picked all 4 locks, go out then reset the instance by right clicking over your own portrait then click the "Reset all instance" button. You can only do 5 instance runs in an hour, which means you can only get 20 skill points in an hour, but if you pick pocket a bunch of mobs during each run, then you will have enough Strong and Heavy Junkboxes to reach 300. Or you can just simply wait until you can go inside again.