Mold the chaos into something beautiful
1. No. You don't get to choose anyway, you have to roll for it.
Play this card at the start of a Zombie Turn on any Hero and roll a Random Building.
That Hero may not search. Discard this card when the Hero moves into a space of that building. If the Hero is already in the building or cannot enter it, Re-roll.
2. There is a Zombie card:
Locked Door page
I think one of the expansions also comes with some tokens were you can lock doors, but I don't remember beyond that.