Now replace pen with any other product and it’s still pretty much the same. How will you market a pen?
To me selling does not mean convincing someone by force but rather talking in a way that makes them understand how useful the thing will be in their life. When people feel their own need, they no longer need to be convinced separately. Then the product is not just a product, it becomes a solution to their daily life, I believe that if something really adds value to someone's work then there is no need to put extra pressure on it to sell it, people come towards it on their own.
Well, the most important art in selling that's often overlooked is building rapport. You might notice you end up going to places the most where people have built a rapport with you over time, whether it's your barber, vegetable shop, or literally anything.
That's because we love living in our comfort zone and someone who goes well along with us helps us stay in that zone. This is why when we meet someone new we are almost always going to avoid dealing with them. But over time, a relation is built and we trust the person.
The problem with 'sell me this pen' is that the person has no prior relation and obviously, the person challenging to sell the pen is acting tough. In real-world sales, it's almost always good to talk about something that's of interest to the buyer and then sell.