Here's a way get a bolt open that most of the time doesn't require follow up work.
Equipment; two blocks of wood, big hammer, cleaning rod and help.
Procedure; place one block of wood on a solid surface, concrete slab works well. Place muzzle on that block of wood, place the other block on the back of the bolt shroud, now hit it hard a few times. Test to see if the bolt will rotate using only hand pressure. If not repeat the process with more force. If it moves at all, it's good start. DO NOT REACH FOR THE HAMMER. Rotate bolt using hand pressure until you reach the action camming surface. Have a friend come in from the muzzle with a cleaning rod, jag removed, and while you apply pressure on the bolt handle, he , with modest effort, tries to drive the case out. Most of time this works, saving the bolt handle and extractor. If that doesn't work then get something that can get down to the root of the bolt handle at the stock line. Then use the hammer to drive the bolt back. If none of this works then get a smith involved.