This key is for Larson Doors only that have a key that is coded 6565. In order for this key to work, your original key would have to have this number stamped on it. Your lock will NOT have a code on it and if the key is lost, we would suggest using a core/key replacement that we offer. This is used on many of the common lever handle door handles. Please see 2029780003 LARSON KEYLOCK ASSEMBLY