Yes, I've had that issue. I found that the catch stud bolted into the door frame was slightly out of position with the lock. I loosened the stud enought that I could move it by tapping it with a rubber mallet. I tapped it into better alignment which made the door much easier to open. Bonus, no longer had to slam the door to close it.
There are other issues which can influence how difficult the door is to open. One is extending the stabilizer jacks too aggressively. Another is having the trailer on uneven ground. A third is the curvature of the door not matching that of the door frame. There are videos on how to bend the door to correct curvature using a 2 x 4. Kinda crude, but its hard to argue with success.
Hope this helps.