Why Millipedes and Roly Polies Are Coming into Your Home

I’m getting tons of these things in my garage. What are they?

You appear to have a variety of pests here, including a crayfish. The majority of your pests are millipedes and pillbugs (also known as roly polies) which indicates that you have a yard with damp conditions that can support them.
This could be due to overwatering or just having mulch near the house which provides them with a moist place to live.