Well if your cookies keep coming out hard maybe you should try reducing your cook time or the temperature your cooking them at ,they will always hardern if over cooked , you can't always go buy instructions on the back of a box beacuse different brands of stoves heat differently.
If you put a piece of bread in the container with the cookies, they will go soft and chewy. I do iy everytimeale cookies. So go ahead and put the bread I'm and by morning, they will be soft. Let me know what you. Think after you go it
Take them out 2-5 minutes before the max time on the back of the box and leave them on the pan for any 5-10 minutes, they will be soft but they will continue to slowly bake using the heat from the pan. This keep mine soft all the time :) hope I helped :)