I was certain I used to be able to make Open spells on "touch" before, but I can't find the mod that enabled it. This mod currently has one job: now you can drop by your preferred altar of spellmaking and create your very own "Open on Touch" spell. Why? Because those underwater chests won't unlock themselves.

*NOTE: The photo I uploaded shows an area of effect at "100" - this doesn't seem to actually do anything in my testing. Only the precise object that I touch with the spell is unlocked. Even if two chests are directly next to each other, I have to cast the spell to unlock each one on touch.