Yes, wallets can be hacked, but I've never had anything like it. I found out on some websites that someone's wallet had been hacked. Hackers can find another way to get their wallets, often via phishing.
Hackers will always find a way to have an access to your wallet and this is what is considered as hacked anyway. The only thing is that no hacker can brute force any wallet to enter it or do some other possible technical means to get in without using some other means in which you fall for as a person and then making your account or wallet becoming vulnerable to your funds being scooped.
For instance, the usage of malware to steal your information, the usage of phishing attack to get the hard to reach details and so many more, which is why it is always necessary to pay attention to everything you do in this space so you do not end up becoming a victim.