Hard Reset SAMSUNG S6310 Galaxy Young

First method:

First, turn off the phone by using the Power button.
Now press and hold together: Volume Up + Home button + Power button, until you see Samsung logo.
Then select from Recovery Mode menu "wipe data / factory reset" using Volume buttons to navigate and Home button to confirm.
Choose "Yes -- delete all user data" to confirm the whole operation.
After that select option "reboot system now".
Well done! The hard reset has just been performed.