Or store it with a slice of apple or citrus rind, tightly enclosed, until it's soft again. Doing so will ruin their flavor and texture at once. Don't keep them on a sunny windowsill either. A cool room temperature is best. Ripe tomatoes, which are basically tropical fruits, and other fruits native to warm climates do not keep will in the cold.
Bananas turn black, avocados stop softening, and citrus fruits get spotty.