In direct inflation terms the minimum wage was ~10.50 / hour in 1968 or around the current minimum wage in France. Though as a percentage of the economy it was more than 20$/hour. Thus, it's not quite as clear cut as you are suggesting.

PS: Inflation is not really a single number as some but not all things end up costing less to produce over time. In other words, A may get more expensive while B becomes less expensive. Which makes long term inflation calculations more complicated.