On the focus the connections for the door handle can go bad...the trick is to push down on the door handle while pulling out on it.
You can view the 2002 Ford Focus owners manual online at : www . motorcraft service . com ( no spaces ) Click on Owner Guides ( page 112 explains the rear door childproof locks with drawings )
On my '02' Expedition the rear actuator went up leaving the door stuck in the locked position, the key nor the key fob would unlock the door. I had to get a locksmith to unlock the door to get the rear panel off then take it in to get the actuator replaced. If this is your problem then if you get a locksmith to unlock the rear door, make sure you take the panel off so you can unlock it from inside.
There are no 2 rear doors.
you would have to take the door apart or save up the money and get it fixed by professionals.
Go to Napa and buy a Repair Manual.
To unlock the rear door ???just push the unlock button on the drivers side door on the in side and it will unlock all doors and the rear door also. then Just pill on the outside rear door handle and it will open., push the button 2 times to unlock all doors.
The 2006 Ford Focus has 47.9 in. of rear hip room.
The 2014 Ford Focus has 53.7 in. of rear shoulder room.
The 2003 Ford Focus has 37.6 in. of rear leg room.
The 2009 Ford Focus has 36.1 in. of rear leg room.
The 2007 Ford Focus has 53.6 in. of rear shoulder room.
The 2005 Ford Focus has 47.9 in. of rear hip room.