Android comes with protection features like Pattern lock or Password lock to prevent your smart-phone from unauthorized use. But if the owner of the phone is forgot Pattern lock or PIN, then problem arises. I am suggesting you some tricks to recover your lock-
Visit at google.com/android/devicemanager on your phone or computer and sign-in using your g-mail that you used on your lock phone. Under ADM, select the device you want to unlock and then select “Lock”. Then a new window appears and asked for password, you can enter a temporary password into this window and click on “Lock” button. Now you got a confirmation tab window having the buttons Lock, Ring and Erase. Now you can see a password field on your phone, you should enter that temporary password and your phone would be unlocked. Now go to the phone settings and disable the temporary password and change your pattern lock that is easy to remember but typical to guess by others.
If above procedure is not working then try this one-
If you don’t remember your password then enter a wrong password or pattern lock 5 times, a window appears. You should select “Forgot Password”/”Forgot Pattern” option in this window so you would able to open a Google login or backup PIN. Enter either your g-mail login or backup PIN and then You would be able to unlock your phone.