Can Terrace be locked by committee members

Separate Terrace keys were given by the builder to some of the members on their demand. However, committee all of a sudden changed the lock of the terrace for security reasons and declared that keys will be given for genuine use on demand. Now key of the new lock is only in possession of one of the committee member. We are fighting that committee can not take decision on their own without considering opinion/views of the member. Secretary is informing that in many societies terrace is kept locked and keys are kept with single person final decision will be taken in AGM and till then terrace will be locked and members are free to take keys from the committee member. Is it right on committee's part to take such decision without consent of the members? Also why we should wait till AGM for final decision? In AGM if majority members keep mum can we get separate keys in our possession as there is no watchman to our society and we do not want to disturb the committee members at odd time. Our Internet and dish tv connection is also on terrace and in case of problem we need separate key of the terrace like earlier. To which authority we can complain on this