How do I disable my students' access to last year's class?

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First time user with Canvas.  Hopefully this makes sense.  I need to know how I cannot allow my students access to my class I created last year and only allow them access to the class this year without deleting last year's class?I just don't want my students to be able to access the old class, I want to make the new class the only one they can access.  I would hope none of the students would click into the old class, but I know there will be a few that will.  So, I want to eliminate that issue if possible.

(Edited to shorten title and place the previous title in the question body)