Sims won't pass through any door

@blacerdamuller  Is the issue about one single location where you've been placing different doors?  It's possible there's something nearby, whether on the ground or a wall, that's blocking their passage.  Try moving everything within four squares of the door, even the items attached to a wall, like a hanging plant.  If this works, you can put items back until you notice the problem again.

If this doesn't help, try saving the house to the library, bulldozing the lot, and putting the saved copy in its place.  You'll need to evict your sims, or move them elsewhere, first, but if you don't like the results of this, just quit without saving.  The point is to see whether the sims can move around the freshly placed copy without issues.