If you push your finger into warm ice-cream, a certain amount of energy is expended to break enough ice-cream bonds so that ice cream can make space for your finger. Think of it as needing energy from your body heat or the energy you use to push down onto the ice-cream to become more liquid. However if the ice-cream is colder(has less energy and therefore stronger bonds), then more energy is required to break enough bonds, getting it to the state/temp where your finger can go into it.
The only difference between something hard and soft is that the harder thing requires more energy to reach a state where it’s shape can be changed.
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