The locked doors are all accessed by completing the main story and side missions which will give you access to all actually there are many doors that you need smartglass to open.
How do you unlock locked doors in dead rising 3.
Search all round the building including the roof if possible.
Unlock the doors is the second story mission during chapter 7 in dead rising 3.
Just do side missions follow along with the story.
Rludeman44 topic creator 6 years ago 3 teknokid7 posted.
Again there is nothing important behind these particular doors.
You will find keys this way doors will become unlocked.
After nick reaches the sunset hills metro station he will find that the door has been locked by the biker gang.
How to open doors with red pannel on them or this weird boxes that in the city.
He will need to find a way to unlock the doors to escape the metro station.
As for the zdc locked boxes around the map you need to download the xbox one smartglass app and receive side missions to unlock them.
Some of these side missions result in opening those doors.
Some buildings have multiple ways in and the door can then be opened from within some doors are opened during main missions and others open during side missions.
My suggestion is to do all the missions and side missions.