Unpaid overtime?

I’m a contractor at a data center making hourly in Wisconsin. It’s a weird situation because they mandate we use their shuttle service to get to and from the parking lot. They’ve changed rules which is forcing me to stay on site for 20-30+ mins plus after my shift ends.

I’m getting mixed results on google on whether or not this is breaking labor laws.

I asked my delivery team and they said any time spent waiting to be moved to the parking lot after shift will not be paid.