>>How to Unlock Lock Pattern Using Command Prompt<<

Step 1: Connect your Android Phone to Your Computer.

Step 2 : Open command prompt as administrator.

Step 3 : Now in command prompt window type the following code carefully exactly as it is
             and then press enter.

adb shell
cd /data/data/
com.android.prov iders.settings/
databases
sqlite3 settings.db
update system set
value=0 where
name='lock_ pattern_autolock'; update system set
value=0 where
name='lockscree
n.lockedoutperm
anently';
.quit

Step 4 : Now you will some screen as shown below and then you can reboot your phone and now     
             when your will start again then try unlocking your phone using any random lock
             pattern and it will work pretty fine.

Step 5 : If you face any problem repeat same steps but instead of the above code try using

adb shell rm /data/
system/ gesture.key

and then press enter and now try rebooting your device to see if it works.