i have tried with several patterns but couldn't solve my issue.
i made a house with just 2 doors.
front door (set it to "front door", and one way setting into inside) and back door (timed and not one way but faced into inside). these are in need for the purpose of locking my simbot in the house for fixed time.
simbot could enter house but he couldn't exit from house. he seems to choose only front door when he tries to exit as if he ignores available back door. so the order of exiting house would be cancelled. and even if i set front door setting off, it doesn't changes.
and another try. i have put 2 doors in line. in this time, he chooses the door by possible shortest route. not by availability. this is the cause i guess.
Bossy discussion in here.