Is My Nerite Snail Dead?

hey i’ve been monitoring one of my snails for a week or two now because he’s been acting different then the other one (not moving as much or not being active at all) i would check by putting him on gravel and seeing if he moved back to the glass and he did a couple times. i’m also not a huge fan of putting my hands in an aquarium unless i’m cleaning because i don’t wanna disturb the peace in the tank but this time he looks weird