passenger door not staying shut?

ok my mk6 I cannot seem too keep my passenger side door shut. the actual mechanism does not "lock" into place. guess you can call it a latch. I can manually move it open and closed with my finger, just that the latch will not stay locked. Now the only way I can get it to close "which is far and few between" is I play with the inside door handle and finally got it to close.
my question is, is it the actual latch? or something that control is to stay locked?

I had the same problem. Sprayed it with silicon lube and all was well.

This has happened to me three times in the past two months. The first time I was an hour away from home, good thing I keep some rope in car