Emigration of a broken principal requires patience and the fly tools.
Keys can schism in locks due to debilitated metal or cuts that are further low. Removing a broken principal from a lock requires patience and the correct tools.The blade of a coping saw, scroll saw or jig saw can work to remove a broken key, as the saw blade teeth act much like the teeth from a professional extraction tool. The blade must be thin enough to fit easily into the lock and "bite" into the key piece using its teeth.
Pliers
Depending on Until when in the lock the break happened, you may be able to pull the broken piece out using a pair of needle nose pliers.
Saw Blade
Licensed locksmiths keep specialized tools to remove broken answer pieces, on the other hand household tools can too create the task.