Capital increase reserved for employees

Need a bit advice on purchase share from the company I work for.
We are currently have a scheme for employees to buy shares through the capital increase by the group.

Basically , Employee can buy the share with 20% discount to the market price, but we have to keep at least 5 years before sell on/back to the market. The company is a fortune 500 company and the performance being steady during past decades.

The share price is around 80GBP per share ,there is no cap for employee for the amount of share we can buy, and I have to get some loan (3.99%apr) if I want to buy more than I can afford . In this case, is it worth doing so?

Thanks.

什么公司的股票80镑一股，还是fortune 500的？？没听说过。。。ETF还有可能
20%的discount，如果5年后股价不变，相当于每年获利4.6%而已。你还要贷3.99%的loan来买，似乎没有多大搞头。
如果5年后股价升了20%，就相当于每年获利8.4%，听上去还不错。看你对你们公司的信心了。

Thanks for your reply, much appreciated.
Been told by college it is fortune 500. checked now it was back to 2009.
Company is call Air Liquide it’s 109 EUR at the moment per share. Is 5 years a long period to hold shares?
Thanks again.