The security of the security door is locked, the key is lost, how to change the lock cylinder at hom

And a bunch of new keys? If you don't have any, you'll have to call the locksmith to open it for you.

I don't know if you can have a small window on the door, if you can open it through this small window for insurance, if the door is not very good, you can use violence to open it, please carpenter repair it will not take much. Ask a lad to help me out. FYI.

When looking for the lock first, let the master use the insert to insert the door lock (the insert unlocking is not to hurt the door lock anything) to open the door and then replace the lock cylinder, so that the damage to the door lock and the door is small, and the price of changing the lock cylinder is not very expensive, in addition, it is recommended that you have better change the door lock of the password lock fingerprint lock to avoid losing the key and not opening the door.

First of all, remove the panel, remove 2 lock nails on the inner panel of the door lock, remove the upper and lower screws of the inner side panel, remove the inner handle panel, and then remove the lock cap and the outer handle, there is a screw in the middle of the stall of the lock body on the door side, between the deadbolts, take out this lock cylinder, and the lock cylinder can be taken out.

Call 114 to find a lockpicking company to deal with it. Or find a way to find the key. See if you forgot where you lost the key.