There are two ways to quickly soften butter from the fridge, and the goal with both is to soften it just enough without causing it to melt.  Option 1 - Heat it for 1-2 short 10 second bursts in the microwave.  Option 2 - Place boiling water in a small bowl or dish and let it sit for 30 seconds to 1 minute. Drain the water and quickly place the bowl or dish over the butter. The residual heat will soften the butter.  Always err on the side of caution if you’re trying to soften butter quickly - it’s better to keep it slightly firm rather than overheating and causing it to melt.