How do I open this tube?

The end of this tube is very hard. I slightly tried to punch the end of a knife into it and also tried a large paper clip but neither budged it. I was a bit timid in trying because I didn

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adhesive - Is there a trick to opening a tube of caulk? - Home Improvement Stack Exchange

Open Ended Glass Combusion Tube is open at both ends, making it ideal for oxidation and reduction of chemical substances.

Eisco™ Open Ended Glass Combusion Tube, 11.8 inch

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1/2 x 4' Heavy Wall Round Clear Plastic Tube

Have a question about DAP Silicone Max 2.8 oz. Clear Premium Kitchen and Bath Silicone Sealant? - Pg 4 - The Home Depot