This wasn’t the only time that prison doors shut by men had been flung open by God.  In Acts 5:19 an angel of the Lord opened the jail doors for the apostles when the Sadducees had them thrown into prison for healing many people.  In Acts 12:7 Peter was jailed by King Herod only to have an angel of the Lord escort him out past all the sleeping guards.  Over the ages mankind has foolishly thought they could shut doors, stopping God’s work… only to see Him fling those doors wide open.   Or they’ve unsuccessfully tried to pry open doors that God had firmly nailed shut.  The truth is – you can’t shut a door God has opened, neither can you open a door He’s shut.