unlocking an ipad

its easy,

1. If you have not enabled touch id and passcode lock on your iPad, Click on the home button and swipe on the screen.
2. If you have enabled touch id, Press the home button.
3. If you have enabled Passcode, Click on the home button and swipe right. Now enter the passcode.

Please tell us how their iPads became locked? Did they forget their 4 or 6 digit passcode? Provide more information for an educated answer.