There is a Samuel & Minnie Klein living in Cleveland, Ward 23 in the 1920 Cuyahoga census.
Samuel Klein36OHHUNGARYHUNGARY Minnie Klein41OHUSUS
There were no children in the household.
I did not find them in the 1930 census. There was a Samuel Klein living in the George Levy household though in Cleveland. Minnie may have died. Since the head of household usually reported the statistics for the family, that might account for the age discrepancy, and the fact that the parents' info is "Europe", rather than a more specific country.