Bought property. One room locked by tenant of previous owner. Remedy?

I have purchased an agricultural land of 8 biswa from its real owner.A defunct old building is also there where for some time state education department ran a school with the permission of the previous owner.Once the school got constructed the school shifted in new govt own premises for all the purposes.One of the school teacher put his lock in one of the room till he was alive but now he is dead.Lock is still there other rooms are open for last 25 years and used by local people for marriage etc free of cost. I want to construct the place and fencing of the land. Should I break the lock myself