Hardware key

Hi JustinHenderson81,

Thanks for contacting Apple Support Communities!

We understand that you'd like to know how to use hardware keys. Can you tell us what you mean specifically? Are you referring to using your Apple Wallet with your car key? If so, you can add a car key to your Wallet as outlined here: Add your car key to Apple Wallet on your iPhone or Apple Watch - Apple Support

"How to add your car key to Apple Wallet on your iPhone

1. Make sure that your car is associated with the account provided by the car's manufacturer. 
2. Open the car manufacturer's app, email, or text message, or use your car's display and follow the instructions to set up a key.
3. When you're sent to the Wallet app, tap Continue.
4. If prompted by the onscreen instructions, place your iPhone on the key reader while your iPhone and car pair.

When you add your car key on your iPhone, it might be added automatically to your paired Apple Watch. Or you might see the option to add it to your paired Apple Watch.

You can also manually add your car key to your Apple Watch. In the Apple Watch app on your paired iPhone, tap Wallet & Apple Pay > the Add button next to your car key.

Learn how to remove your car key from Apple Wallet"

If you're referring to something else, just let us know specifically what you'd like to achieve.

Take care!