UPVC doors are very common in parts of the USA due to their comparatively high levels of safety measures along with excellent draft proofing and low protection properties. There are relatively a few tribulations that can happen over time and most can be prevented or sorted quite easily.
The most probable difficulty you will meet is when you go to lift the handle up and it seems “inflexible”. If this is happening please make an effort to repair the problem or call in an expert locksmith. If you continue to keep using the lock there is a very good possibility the lock will stop working and the worst case situation is it fails in the locked position when you’re outside. This will mean getting a locksmith to not just get you in but also most probable change the whole locking system, not a contemptible scenario.