\documentclass{standalone}
\usepackage{tikz-qtree}
\usepackage{fontspec}
    \setmainfont{Charis SIL}
\begin{document}
% In the preamble:

\begin{tikzpicture}[sibling
distance=10pt, level distance=20pt]
\tikzset{frontier/.style={distance from root=60pt}}
\Tree[.unlockable [. un ] [.lockable [. lock ] [.able ] ] ]
         
\end{tikzpicture}

\end{document}
