Does an employer have to except your work release for light duty?

I live in Wisconsin, I have been off work for almost 2 months. My employer excepted my request for family medical leave. My Doctor has released me back to work but with light duty for 2 more months. My employer has refused my release to work saying there is no light duty for me. Can an employer do this? My injury was not work related so I cannot collect workman's comp. Can i collect unemployment now that they refused me to go back to work?