I don't know what is there in Pakistan's labor law, but in India, it is regulated by the Employees' Provident Fund and Miscellaneous Provisions Act, 1952. Under the said Act, there are three schemes: Provident Fund Schemes, Pension Schemes, and Employees' Deposit Linked Insurance Schemes. Of these, paragraph 16 of the Pension Schemes addresses widow pension, which is available to the widow of a member. It is also stated that a contribution to the pension scheme for at least one month is required to enable the widow to receive this pension.