You might try some lubricant like Vaseline ,sewing machine oil ,DW40 or even cooking oil and after you have soaked the zipper and along the track both ways use a pair of pliers or similar to grasp the zipper and move it in the direction that should open the zipper ! this might be difficult at the start so dont use excessive force in fact a push and pull method often works best ( or pull one way and then the other )because a realignment of the zippers teeth is often what is required and forcing the zipper can often tear them away from the material and a zipper replacement would then be necessary, other causes of stuck zippers are things like stray cotton or material caught up in the teeth and zipper ! If you do end up having to force the zipper maybe replace the zipper with a strong Velcro or a more robust zipper with larger teeth .
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