I like how you managed to gain a bit of engagement with that small interactions, without any real gameplay. You should make sure that the player will find them though - first door I bumped into was not interactive, so me going into the interiors, which are a huge part of your game world, was a pure accident. Even when building an open world, without a direction, make sure to guide at least a few first steps and hint that there are interactions possible - if you can't open some of the doors, make sure they somehow stand out - the one that was barricaded was a good example of that, but you could also play some sound effect upon bumping onto them, to show that those are locked. Then you encourage player to experiment with other doors and see if those are locked too :)