Seedling not shelling issue..

So I've started growing these 2 autos at the same time and one is growing fine whilst the other literally won't come out it's shell. I've prised it open 2 days ago but still nothing. Is there anything else I can do or is this one done??? it's meant to be a premium seed so I don't really want to throw it away, unless I have to.
Thanks

Put it in a moist paper towel and place inside zip lock bag and check back in a few days. If it’s viable it will pop with this method.

The enzyme in saliva should dissolve it's hinge so it falls off or loosens,
I just did this the other day on a Seed stockers seedling that got it's case stuck.
Spat on my finger dribbled it on and brushed the two cases off after around 10mins.

Thanks guys, I'll try out these techniques and see what if it works.