Your right to legally evict your tenant starts only on expiration of tenancy agreement. But since he defaulted payment of rent you acquire right to legally evict him immediately.
Give him a notice to open the premises for your inspection and to pay the rental arrears. If he fails to do so, you can initiate legal action not withstanding persistence of agreement period .
As far as exparte orders, the court will decide on your application. His failure to reply or acting upon your notice will help you get exparte orders from the court.
But in no case, you can break open on your own without the help of the court. That will be illegal and you will be held responsible for consequences.