Go to Settings > Siri & search Option. Here you’ll see the different types of shortcuts that you can setup. Tap on the plus sign to set up your desired shortcut. You'll have to go on a record screen where you can record a personal phrase that you can say to run the shortcut. You can record a personal phrase to close the garage door. Once you are done recording, you’ll be taken to the screen then press Done to complete the shortcut setup. Once you’ve completed the shortcut set up, the new shortcut will appear under “My Shortcuts” under Settings > Siri & Search. After you’ve added a shortcut to Siri on your iOS device, you can run the shortcut by asking Siri your phrase on your iOS device. Just say "Hey Siri," then say the personal phrase you created for the shortcut.