Failure of the Play button is a common problem for many users. The easiest option is to switch the Touch Bar settings - this instantly brings the Touch Bar to life and takes a few seconds. For example, if you have "application control buttons," choose to show the "Advanced Control Bar" instead. There is another way. You should use the key combination Ctrl + Command + Q, which locks the laptop screen. Press this key combination or select the apple in the upper left corner and look for "Lock Screen" in the menu. The screen will be locked, and all running applications will work; their data will not be lost. Now unlock the screen with TouchID or a password. The touchpad will work again. I learned a lot on my own, but when my mac broke, I took it to a service center at https://www.salvagedata.com/apple-mac-recovery/, where they fixed my laptop.