Some of these side missions result in opening those doors.
How do you unlock locked doors in dead rising 3.
How to open doors with red pannel on them or this weird boxes that in the city.
Search all round the building including the roof if possible.
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.
Again there is nothing important behind these particular doors.
If you use xbox one smartglass on a tablet or smartphone or windows 8 computer you can get extra side missions which have codes as rewards.
For dead rising 3 on the xbox one a gamefaqs message board topic titled locked doors.
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.
Rludeman44 topic creator 6 years ago 3 teknokid7 posted.
After nick reaches the sunset hills metro station he will find that the door has been locked by the biker gang.
He will need to find a way to unlock the doors to escape the metro station.
Just do side missions follow along with the story.
Doors are normally unlocked by either finding an alternate route and opening it from the other side or completing side missions.