How can I use interp2 with 1 query point?

Following the code. I can't understand what is the problem. Thank you in advance!

Is there a better method to do this type of interpolation?

s=0.12;
hth=1.23;
s_ls=[0 0.03 0.05 0.1 0.15 0.2 0.25]; 
hth_ls=[0.2 0.4 0.6 0.8 0.1]; 
k1_ls_02=[1 1 1.6 2.8 4.45 5.5 6.25]; %values of k1 for ht/h=0.2
k1_ls_04=[1 1 1.5 2.6 3.5 4.45 5.3]; %values of k1 for ht/h=0.4 and s
k1_ls_06=[1 1 1.3 1.75 2.6 3.4 3.65]; %values of k1 for ht/h=0.6
k1_ls_08=[1 1 1.2 1.5 1.9 2.15 2.3]; %values of k1 for ht/h=0.8
k1_ls_10=[1 1 1 1 1 1 1]; %values of k1 for ht/h=1.0
k1_ls=[k1_ls_02; k1_ls_04; k1_ls_06; k1_ls_08; k1_ls_10];
[s_ls_matrix,hth_ls_matrix]=meshgrid(s_ls,hth_ls);
k1=interp2(s_ls_matrix,hth_ls_matrix,k1_ls,s,hth);

Error using griddedInterpolant
Sample points must be sorted in ascending order.

Error in interp2>makegriddedinterp (line 226)
F = griddedInterpolant(varargin{:});

Error in interp2 (line 134)
F = makegriddedinterp(X, Y, V, method,extrap);

[dpb]

hth_ls=[0.2 0.4 0.6 0.8 0.1];

Is the above a typo, I'm guessing? Either the 0.1 was intended as 1.0 or it is misplaced at the end of the vector instead of the beginning.

[Torsten]

Furthermore, you try to extrapolate to a value of 1.23 for hth (values are only given k1_ls are only give for 0.2 <= hth_ls <= 1).

interp2 will return NaN in this case.