For reference, as set in the forum configuration. If someone enters an incorrect password 4 times in a row, the account will be locked for a period of around 15-30 minutes.
If you keep trying to login during the lock I believe it will extend that time onward, so stop trying to login, go make a cup of tea and come back later.
The point of this is if someone is trying to guess your password, they could just wait 15 minutes and try again. Generally these are automated systems who will keep going until they get in or the person running it moves on to the next website.
This kind of attack is reliant on weaknesses in your choice of passwords, such as using a word that appears in a dictionary - such as the word - "password". Sometimes they are more clever for those who think adding numbers on to the end helps - so they would try "password123" for example.
For anyone who reads this message and still can't get in, feel free to email me via firstname.lastname@example.org and I'll keep an eye on it this weekend.