Recently I put password on my laptop HDD but after sometime I couldn't access the laptop because I lost my password.
Can anyone help me to unlock HDD.
Thank you in advance.

Unfortunately NO.

Refer to the nearest professional AND be prepared to provide proof of ownership (= prove the laptop is yours) OR ask the support service of the brand (i.e. Asus, Acer etc.).

If you are able to google something that works for you, it's good.
Otherwise, these requests are a potential if not certain source of troubles so it's quite sure you won't get too much help HERE.

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I think if this is actually your computer you can get it unlocked by a professinal. See here it is sort of like this. You can request help in your password unlock but if you get it that is another story. How do we know this is your PC or HDD you are trying to unlock. In all the years we do this work not too many people forget their password. Now all of a sudden it seems that everyone is forgetting their passwords. One solution is this. Buy a new HDD and put it in and start over again. Set this one away and maybe one day you will remember your password. Then you can use it again.

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Iorana Haraharaini