Easy to replace with the aforementioned part.
Everybody has to learn to make sure that they crank the knob all the way counterclockwise from the inside or outside before putting pressure on the door to open. We went thru three of them initially, but now it's automatic for all of us and the last replacement's been going strong fur 4 years now! It's a design weakness, but it is behavior that can be learned!
Another iffy part is the large plastic slider in our screen doors. If one leaves it in the halfway open or halfway closed position when folding the screen door into the main door, the inside door handle of the main door begins to destroy the brush-like insect screen in the gap in the plastic part and eventually it becomes a small bug door--lovely in summer evenings with lights on inside and the screen door rendered worthless. One person in my family still hasn't mastered the concept here although they have it for the shower door: all moving parts on the shower door and on the screen door are to be either all the way open or all the way closed--never in between! With that little mantra, all is good.
The shower door knobs are very inexpensive--the shipping may cost more than the part-- so order three so you have two backups.