As mentioned, try a lubricant.
My go to dry lubricant where I want to minimize transfer damage is candle wax. Take a old unlit candle and drag it across the surface of the strike plate and the spring loaded latch. Then opening/closing a few times and see if that resolves the issue.
Additionally it was mentioned to check the strike plate, make sure the spring loaded latch is close to centered to the strike plate.
Also check to make sure the strike plate is not too close to the door. If it is then you may have issues with door swelling/rotting making the door larger than the opening.
Also sometimes if you have uneven parking or to much stabilizer pressure you can twist the RV frame and body some which causes the door opening to no longer be plumb and square.. Adjust your stabilizers some and/or reposition the RV to see if that helps.
All else fails, you may need to replace the latch, they can and do go bad and start sticking, even ones in sticks and bricks.
