What shall we do? There is no key.

1. If there is someone in the house, you can knock at the door. The family will open the door for you as long as they hear the sound.

If the house is empty, you should call your family and ask them to deliver the key, or you can get the key yourself.

If your family doesn't bring it, call the unlocking company directly and ask them to unlock it. However, if you need to provide relevant documents, you can directly let the property come forward.