How to Unlock Android 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.providers.settings/databases
sqlite3 settings.db
update system set value=0 where name='lock_pattern_autolock';
update system set value=0 where name='lockscreen.lockedoutpermanently';
.quit

Step 4 :   Now 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.