For the Sharkbite PEXA quarter turn valves at our place, Off is clockwise, ON is CCW.
But yea, I had to turn the handle with some pliers, while holding the body with another set of pliers. Once you loosen them, they can be operated by hand.
I'll echo the strong suggestion of doing this when stores are open. Better yet, get a Sharkbite PEX shut off valve to have handy, and attempt to close the valve with the longest piece of PEX sticking out of the wall.
Once you figure out which way you have to turn to close it (with the wrench) then you can do the same for the others. You'd have the Sharkbite shutoff valve in case something goes wrong