Keyboard on off ??

Press the on/off button ? Slide the on/off slider ?

The Magic Keyboard, Magic Keyboard with Numeric Keypad, and Magic Trackpad 2 have a slide switch on the back edge of the device. Slide the switch to turn on the device (green coloring becomes visible). Earlier Apple Wireless Keyboard models have a power button on the right side of the device.

If your Apple wireless mouse, keyboard, or trackpad isn't working with your Mac as expected

https://support.apple.com/en-us/HT204621

Set up your Apple wireless mouse, keyboard, and trackpad

https://support.apple.com/en-us/HT201178

Your shift key is locked: look at the keys on your keyboard: on the left side, 4th row, a green light is on. Click on that key, the green light will turn off. If you want to typ a number, click on the shiftkey below =5th row), hold it and click on a number