Being "forced" to do something means that something made you do it.
For example, when a manager says that employees have been laid off:
As you're all aware, we've been forced to make significant cutbacks.
...it sounds as if the company didn't want to lay off those people, but had to do it for some reason that they couldn't control.
Most of the time, people use "forced to ___" to talk about things that someone had to do:
Child soldiers in these countries have been forced to witness and carry out extreme acts of violence.
The native people were forced to convert to Christianity.
But sometimes people use this expression when they don't want to take responsibility for something that they've done.