If you can't remember any passwords to get in, the only fix would be to reset the phone.
Power off.
Then power on with all three buttons (power, volume up and volume down).
You should see a black screen with white writing, this is the ap boot menu.
Volume down to move the hilight to recovery.
Volume up to select.
When triangle shows up, press both volume buttons.
You will now be in recovery.
In recovery, volume buttons move the hilight and power button selects.
Move down to wipe data, select with power button.
If it asks you to confirm, select yes or whatever.
Thus will wipe all data from the phone including all apps you downloaded but when the phone comes back on, you will not have to worry about the locked screen.
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