how to force shut down ipad while in screen lock mode?

Have you tried a reset?

Reset iPad: Press and hold the Sleep/Wake button and the Home button at the same time for at least ten seconds, until the Apple logo appears. Ignore the "Slide to power off".

Try a reset. Press & hold the Power and Home buttons together, ignoring the red power-off slider, until you see the Apple logo. It is safe to do, there should be no content loss. It is the same as rebooting your computer.

De nada amigo.

Thank You for extending the courtesy of awarding points to comments that are helpful or provide answers in the Apple Support Communities, as this is not mandatory, but it is much appreciated!

thanks you save my life..............:)

Thanks...really help...

Yeah, holding them down until getting to the shutdown screen was not long enough. Thank you . . . .