Can the householder's key be discarded as a decoration key?

Theoretically, yes, because all security doors are equipped with two sets of keys, one for decoration and the other for master key. After the transformation, the secondary key will be invalid after opening the door once with the primary key.

In fact, the difference between the master key and the slave key is that the height of a tooth is different. The master key is high (toothed) and the slave key is low (toothless). When using the secondary key, the corresponding lock cylinder is not pressed (the lock cylinder control function at this position is not started). After the master key is used once, press the corresponding lock cylinder to activate it. This lock cylinder must be pressed every time after opening the door, so the slave key is invalid.

From the safety point of view, you can open the door by raising the position of this tooth on the secondary key, but in fact it is very troublesome. After all, it is easy to pull out a tooth (just grind it off), but it is difficult to grow a tooth.