Similar to the previous phone, when you unlock the graphical keys on LG by resetting to factory settings, the phone must be turned off and charged. Resetting the phone will erase all data from it.
LG Nexus 4 - press and hold both volume buttons and power button simultaneously for 3-4 seconds. You will see the image android, lying on his back. Using the volume buttons scroll Recovery Mode and press the on-off button to confirm the selection. The device restarts and displays the android with a red triangle. Press and hold the power button for a few seconds and increase the volume until a menu appears.
Go to the menu Settings - Factory Data Reset, select «Yes» via the volume control buttons and confirm by pressing the power button.
LG L3 - simultaneously press "Home" + "sound down" + "Power".
LG Optimus Hub - simultaneously press the volume down, home and food.
I hope these instructions you able to unlock your unlock on your android phone. I also hope that this instruction is needed precisely because you have forgotten the password, and not for any other reason.