Samsung GT-S5360 screen unlock My mother has forgotten her screen lock password. is a four digit number. how can I reset phone so she can use it again?

Please assist!
Follow this process only if mobile data is disabled and phone PIN locked. What I'm giving is Factory Reset method.
(Warning: Factory reset erases all the data from the phone permanently. Phones resets to its initial state.)


Charge the phone fully.
Switch-off the phone.
Try these combinations -  



  volume key up+middle home key+power key


-or-  


  volume key down+middle home key+power key



A windows pop-ups for confirming Factory Reset/Wipe Data. Confirm it.
The reset process completes in a minute or two.