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We develop an $A_4 \times Z_4 \times Z_2$ symmetry extension of StandardModel under the minimal extended seesaw (MES) mechanism which successfullypredicts neutrino masses and mixings patterns. This model breaks $\mu-\tau$symmetry of neutrino mass matrix and explains leptonic mixing with non-zero$\theta_{13}$. We study the phenomenological results of the keV-scale sterileneutrino as a dark matter candidate along with other phenomenologies such asneutrino oscillation observables, neutrinoless double beta decay, baryogenesisvia leptogenesis, etc. Dirac CP-violating phase $\delta_{CP}$ and two Majoranaphases $\alpha$ and $\beta$ are also calculated from the leptonic mixingmatrix. Best-fit values of the model parameters and neutrino observables arecalculated from $\chi^2$ analysis. The model predicts best-fit values ofneutrino mixing angles to be $\sin^2\theta_{23}=0.555,\\sin^2\theta_{12}=0.301$ and $\sin^2\theta_{13}=0.022$ for normal hierarchy.Significant results consistent with experimental data are also observed foreffective neutrino mass $m_{\beta\beta} \sim (0.97 - 5.02)$ meV, effectiveelectron mass $m_{\beta} \sim (0.084-0.41)$eV and sum of active neutrino masses$\sum m_{i} < 0.12$ eV. The model does not favour Inverted hierarchy at the3$\sigma$ level with the given parameter space.

KeV dark matter in minimal extended seesaw model and its predictions in neutrinoless double beta decay and baryogenesis