There are many ways to melt butter and thankfully, our natural climate helps that happen. If you leave your butter out for 15 minutes or so, it will definitely soften considerably, but remember that if you don’t pay attention to it, it could melt.
You can also cut the butter into smaller chunks, which allows it to melt and soften faster than a full stick of butter. Or you can put the stick of butter in a ziplock bag, then using a rolling pin, flatten the butter. It won’t melt it, it’ll just soften it, which is exactly how you want it anyway.