To force close you games, means you are closing out the game from running in the background.
On iphone, ipad, etc. ( you are not deleting the game and redownloading it)
Click you home button twice, your icons will show up at the bottom
Then you hit the red minus sign for the apps you want to close out. you can scroll to find more.
You are not deleting the apps just closing them out. When you have app run in the background, it takes memory and slows up the games.
You cannot open the storage building. To get to your inventory hit the edit button at the bottom of the screen, then tap the inventory chest shown on the screen.