Samsung GT-S5360 screen unlock
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.