Key locked position kwikset - Yale Y150/30/125/1 Combination PadLock

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I've heard of this problem happening. Whenever the key is changed, check it several times before locking the door. If you have keys duplicated, the duplicates must be very accurate or they might not work reliably. Difficult to know what causes this, unless someone is tampering with the lock, or resetting it improperly. Or could be defective cylinders - which would be disappointing. Pin-tumbler cylinders do not have this problem, it's something unique to Kwikset
Smartkey.

Kwikset locks are inexpensive because they do not have replaceable parts. Buy a new one.

By the time the lock breaks, it's probably time to get different keys, but if you have so many keys in the hands of people you cannot contact, or you have more than three other locks keyed alike, and you must have the new lock work with the same keys as before, the place where you buy new locks probably has someone who can rekey the new lock to your old keys. Kwikset also sells locks that you can rekey to other Kwikset keys yourself. They are more expensive than other locks of the same type, but could save money long term, especially if you find a need to rekey your locks a lot (lots of visitors, part-time tenants or roommates, your kids lose their keys a lot, etc.)

Watch this video:
http://www.kwikset.com/Customer-Support/How-To-Center.aspx

Your out of luck this new design is terrible once it locks up and no keys turn it, the lock is done you will have to replace it use the traditional pin tumbler style kwikset and it can be rekeyed unlimited times by a locksmith with or without a key.

Kwikset Smart Key locks are complete junk. I am a locksmith and I am constantly going from house to house replacing these "dumb key" locks with original kwikset pin tumbler locks. What happens is either your key or the wafers inside the lock wear slightly, slightly enough to cause your keys to not turn, and since these locks cannot be picked due to a side bar system, they must be drilled off and thrown away when this happens Unless you have another access point to get in the house. If you do remove lock from the inside, throw it in the trash, buy original kwikset and replace.

Here is the instructions from kwiksets website

http://www.kwikset.com/Files/PDF/SmartSeries/SmartKeyInsEnglishOnly.pdf

original key or new one dont work now how to fix this please , i have the smart key kwikset.

Make sure that the bolt hole on the jamb side is recessed enough so the bolt gets a full extension. Without this externsion the bolt will not engage the key release. So when you do your quarter turn you are actually turning more. Remove the strike plate and drill the hole deeper until the bolt can extend all the way. Also double check your key to make sure it is not spurred or worn.

Visit your local Home Depot and purchase a Kwikset re-keying kit. They're inexpensive and work fine but stay alert and follow the instructions properly. This kit comes complete with proper pins as well as new keys. Good Luck!