Once the two screws have been removed the handles should just slide away and.
Spring in door handle broken.
We have an article that will guide you through measuring and purchasing a replacement door handle which you can view here.
Purchasing replacement spring cassettes.
Flip the button spring.
The button handle has a spring that is roughly cone shaped.
Remove the handle and check to make sure the large end of the spring is toward the door.
If your upvc door handle is relatively modern then it will likely have spring cassettes already built into the handle which may be broken.
If the small end of the spring is toward the door it may slip into the door hole and bind.
Repairing the spring in an old door handle.
To check this you will need to remove your door handle by unscrewing the two screws visible on the internal handle.
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If your door handle is not returning to the horizontal position it is almost certainly because the spring has broken in either one or both of the handles on the door.