Maybe you could use one slider with 2 directions. E.g. the slider button starts ...

puns on Jan 6, 2010 | parent | context | favorite | on: A basic usability test on ten phones

Maybe you could use one slider with 2 directions. E.g. the slider button starts in the center, and you could slide it right to unlock and go to the home screen, or slide it left to go straight to the phone screen.