Wow, a car only a year old shouldn't be making noise opening and closing door.
If car was 10 years or older, I would suggest looking at hinge pins. They will wear over time an need replacement. Groan noise is often accompanied by door hanging slightly lower than it should at latch side.
To replace, use dremil tool to grind off head and punch to knock hinge pin out. Replacement pins and brass bushings are available at dealer.