The most common front door keys for locks made by YALE UNION and CHUBB can be replaced from your sample key as a direct copy or as additional keys for locks sold by Lock Doctor Services Ltd. If you cannot identify the key you require then send us a sample (email a good photo of the lockface or existing key). We recommend that sample keys are sent to us to be Signed For. Most keys cut to sample are available within a week of ordering. Keys cut to a good photograph or scan are usually supplied NEXT DAY.