To do it "safely" you wait until the foliage has faded and dried after the first frost. Like almost all bulbous plants, allowing the foliage to ripen and mature and provide necessary photosynthesis will fortify and strengthen the corms for the following year.

Then again, if you live in a zone 7 or higher, you can just leave them in place and mulch well.

To safely store them, begin by ensuring that the plants' foliage has naturally died back, which is essential for the corms to store energy for the next blooming season. Once the leaves are yellow and wilted, carefully dig around each plant using a spade or fork to avoid damaging the corms. Gently lift them from the soil and shake off any loose dirt, using a soft brush for any remaining soil without harming the corms. The corms should then be cured in a dry, well-ventilated area away from direct sunlight for about a week to harden their outer skins, which helps prevent rot during storage. After curing, clean the corms again, remove the old, dried-up corms from the base, and inspect each one, discarding any that are damaged or show signs of disease. For storage, place the corms in a cool, dry place with temperatures ranging between 35-45°F (1.6-7.2°C) and good air circulation. Mesh bags, old pantyhose, or cardboard boxes filled with dry peat moss, vermiculite, or sawdust are ideal for storing the corms as they prevent moisture accumulation and fungal growth.

If you have to do it now, chop off the leaves, pull them up, stick them in the fridge and dry them out. Store them in the fridge, until there's a cool basement to store them in. There's no guarantee it will work. If you're moving, you could try transplanting the whole plant. If you're doing some major garden work, you could try transplanting them to some back corner. You want to water well, if you transplant. Some plants will do okay in a miserable shady corner long enough for you to be ready to transplant them back to a better place.

Knowing the reason they need to be stored right now would help find a suitable method for you. Is it for a short time or do you need to keep them until next year?