Year old asphalt driveway is still soft - chairs make holes
When I built my 1st home 40+ years ago I noticed that my neighbor had a beautiful, smooth, and very black asphalt driveway. I remarked to him that it looked great. He said it looks great but has the same problem that you are describing, being very soft on a hot day. I inquired about this problem with the asphalt driveway guy and he said that an asphalt driveway can be black,  beautiful, and soft or I can be "kind of black" with some gray stones showing and very hard. I chose the latter and found that it was almost indestructible. He had to replace his driveway in a few years and opted for one like mine.