You're basing that, I assume, on the US Recommended Daily Allowance for protein which is 0.8g protein/kg body weight -- or 65 g for your example of a 180 lb person.

But this metric is widely misunderstood [1] -- "it’s the minimum amount you need to keep from getting sick — not the specific amount you are supposed to eat every day."

If you follow the link, you'll see that doctors actually recommend around double that for full health, and that Americans on the whole actually consume too little protein in comparison. The idea that we consume too much protein is actually a long-popular myth.

So no, the Pret sandwich is nowhere even close to half the protein you should be consuming daily.

[1] https://www.health.harvard.edu/blog/how-much-protein-do-you-...