It's hard to tell from the photo, but it appears to have a pointed nose. If so, I think you're dealing with a Western Hog Nose. Like a gopher snake, they are non-venomous. Unlike a gopher snake they often play dead when scared, whereas gopher snakes in the wild tend to be aggressive. It's hard to say without a closer look at its head, but they looks similar to each other.

I've always liked snakes, and had several snake "pets" over the years when I was a kid. I sort of became a snake-nerd.