I am an old employee of a private enterprise with poor welfare. The company asked me to buy shares. Is this a pit?

That depends on what the company does.

How long has the company been established,

How does the company's business strategy work?

If the company aims at long-term interests, the temporary interests are completely understandable, and you can also try boldly, knowing that the original interests of a better company are considerable.

If the company's management team is not good, the boss makes mistakes and has no long-term goals, then you should look at it before making a decision.