Unlocking a Yale door lock with a key can be easy, but there are troubleshooting steps to take if it's not working. First, ensure the key is inserted all the way and turned in the correct direction. If not, check if the battery needs replacing or if there's an issue with the lock installation. Yale door locks are designed to work with various doors and handle sets but ensure compatibility before installation. If you need to reset your Yale door lock, consult the manufacturer's instructions. With these tips, unlocking your Yale door lock with a key can be quick and hassle-free, adding extra security to your home.