How can I create my custom Reset Password Token

I am using plugin

<type name="MagentoCustomerModelAccountManagement">
    <plugin name="custom_change_reset_password_link_token"
            type="VendorMobileAppPluginAccountManagementPlugin"
            sortOrder="10"
            disabled="false"/>
</type>

and using Around on method aroundChangeResetPasswordLinkToken but problem is it is working on APIs but when I try to access the reset link on web it always gives me error

Your password reset link has expired.

Here is my implementation

/**
* @param AccountManagement $subject
* @param callable $proceed
* @param string $customerId
* @param string $newPasswordToken
* @return bool
*/

public function aroundChangeResetPasswordLinkToken(
    AccountManagement $subject,
    callable $proceed,
    $customerId,
    $newPasswordToken
) {
    $customToken = ( string ) $this->random->getRandomNumber( 100000, 999999 );
    return $proceed( $customerId, $customToken );
  }

When I pass a 6 digits string directly it works for example

    return $proceed( $customerId, "123456" );

IDK what’s the issue please help, Thanks in Advanced