i pad has frozen cant access key pad to unlock

Try a reset:

Hold the Sleep and Home button down until you see the Apple logo.

Frozen or unresponsive iPad

Resolve these most common issues:

• Display remains black or blank

• Touch screen not responding

• Application unexpectedly closes or freezes

http://www.apple.com/support/ipad/assistant/ipad/

iPad Frozen? How to Force Quit an App, Reset or Restart Your iPad

http://ipadacademy.com/2010/11/ipad-frozen-how-to-force-quit-an-app-reset-or-res tart-your-ipad

iPad: Basic troubleshooting

http://support.apple.com/kb/TS3274

 Cheers, Tom 😉