Can the decoration key of the security door be locked from the outside?

Definitely not.

If it's the safety pin inside the lock, it can't be opened. That and the lock cylinder are not a control mechanism.

It depends on what kind of security door your home has? Like our spring anti-theft door has a few is the outside of the anti-lock, the inside of the person has a key or pressure handle can not be opened, this is our patent, you can go to the store to see.

The anti-theft door is equipped with an anti-theft lock, which can resist abnormal opening under certain conditions within a certain period of time, has a certain safety protection performance and meets the corresponding anti-theft security level. Generally speaking, the part of the lock body that can be controlled by the key on the outside, if you are inside, how to lock it, of course, can be opened. In fact, many locks can be seen that there is a small lock inside the door, and there is no keyhole outside, so you can't open it outside. >>>More

The inside is locked and the outside person can't open it even if he has a key, otherwise it won't be called a reverse lock; There is also a situation that your lock body anti-lock function is faulty, causing you to perform the anti-lock operation, but in fact the anti-lock cannot be realized.