Switzerland Transit Visa... Indian National.. 11 hrs stop over... Portugal Work Visa...?

I am an Indian National. I have valid work visa of Portugal (It is not a Schengen Visa). Going back to India (Mumbai) from Portugal (Lisbon) via Switzerland (Zurich) with 11 hrs stop over at night. Do i need a Transit visa for Switzerland? Can I go out of the airport and spend night at Hotel in Zurich?