When the mice get smart enough to figure out snap traps, you just have to become more creative with them.

I used to put several of them parallel to each other in a corner - there was no way to get to the food on the innermost trap to the corner was for the mice to climb over multiple traps. Even the craftiest of mice die with that sort of set up.

As for the glue traps - ideally you don't just leave the mouse attached to the glue till they die, you find them attached to the glue trap and then you find some way to kill them humanely.