Certain types of door thresholds, within certain houses, seem to cause issues if you are using the 3rd-person view, and if your camera angle is a little high. You character will attempt to move through the door, but you will continually "bounce" back away from the threshold.

I've experienced this on a few doors - maybe all of the same model of house. The screenshot shows one type of house in the town called "Msta" (according to this map - http://dayzdb.com/map#5.111.101). The first image shows the door and the camera angle. The second image shows the house model. If you look closely, the cursor on the second image is over the door in question. {F28578} {F28579}