Yes, actually, they can. In any case, Apple has said that they will follow what the courts decide, however reluctantly.

They can not force Apple if it implies invading the privacy Of Apple customers.

If they allow it, will be opening a can of worms. The FBI can do as they want. Apple is protecting the pravacy of all its customers. Its a violation of privacy do what FBI is asking.

Apple has to protect customer privacy. I oppose Apple to give any information to the FBI.