Well you could try sheer willpower, though if there is some reason why your body feels reluctant then you are probably better off trying to discover what that is. Perhaps you're not confident of the landing position, so practice holding a good solid landing position. This clip has a lovely one with deep knee bend and a strongly held free leg:
https://www.youtube.com/watch?v=l_emJhcFnXgTry to feel what part of the jump worries you.
Other things that work for me: Two footed takeoff and/or landing, to build confidence, do the jump more slowly, take a break and try to forget you're blocked and then surprise it by jumping.
You can do it off ice quite easily, so practice lots and feel where your weight is when you take off - not too far forward or back, and when you land. Make the landing really stable with no wobbles. It is physically hard to land and be stable, even from a fairly small slow jump. When you see experienced higher level skaters landing jumps and it looks easy don't be fooled - their core, legs, back, shoulders, obliques, lats etc etc are working hard and strongly contracted and they are in good shape, they do off-ice training to enable them to skate like that. If you are lazy and floppy in your body you will not be stable and will not feel safe.
I think most skaters get blocks about jumps now and again - don't worry, you will get past it.
